extend attributes proto for Prefix SID support

Signed-off-by: Serguei Bezverkhi <sbezverk@cisco.com>

8 files changed, 1260 insertions, 583 deletions

diff --git a/api/attribute.pb.go b/api/attribute.pb.go
index fe9d9242..8086432e 100644
--- a/api/attribute.pb.go
+++ b/api/attribute.pb.go
@@ -100,6 +100,12 @@ It has these top-level messages:
 	LsAttributePrefix
 	LsAttribute
 	UnknownAttribute
+	SRv6StructureSubSubTLV
+	SRv6SIDFlags
+	SRv6TLV
+	SRv6InformationSubTLV
+	SRv6L3ServiceTLV
+	PrefixSID
 	MultiProtocolCapability
 	RouteRefreshCapability
 	CarryingLabelInfoCapability
@@ -2912,6 +2918,180 @@ func (m *UnknownAttribute) GetValue() []byte {
 	return nil
 }
 
+// https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02#section-2.1.1
+type SRv6StructureSubSubTLV struct {
+	LocalBlockLength    uint32 `protobuf:"varint,1,opt,name=local_block_length,json=localBlockLength" json:"local_block_length,omitempty"`
+	LocalNodeLength     uint32 `protobuf:"varint,2,opt,name=local_node_length,json=localNodeLength" json:"local_node_length,omitempty"`
+	FunctionLength      uint32 `protobuf:"varint,3,opt,name=function_length,json=functionLength" json:"function_length,omitempty"`
+	ArgumentLength      uint32 `protobuf:"varint,4,opt,name=argument_length,json=argumentLength" json:"argument_length,omitempty"`
+	TranspositionLength uint32 `protobuf:"varint,5,opt,name=transposition_length,json=transpositionLength" json:"transposition_length,omitempty"`
+	TranspositionOffset uint32 `protobuf:"varint,6,opt,name=transposition_offset,json=transpositionOffset" json:"transposition_offset,omitempty"`
+}
+
+func (m *SRv6StructureSubSubTLV) Reset()                    { *m = SRv6StructureSubSubTLV{} }
+func (m *SRv6StructureSubSubTLV) String() string            { return proto.CompactTextString(m) }
+func (*SRv6StructureSubSubTLV) ProtoMessage()               {}
+func (*SRv6StructureSubSubTLV) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{90} }
+
+func (m *SRv6StructureSubSubTLV) GetLocalBlockLength() uint32 {
+	if m != nil {
+		return m.LocalBlockLength
+	}
+	return 0
+}
+
+func (m *SRv6StructureSubSubTLV) GetLocalNodeLength() uint32 {
+	if m != nil {
+		return m.LocalNodeLength
+	}
+	return 0
+}
+
+func (m *SRv6StructureSubSubTLV) GetFunctionLength() uint32 {
+	if m != nil {
+		return m.FunctionLength
+	}
+	return 0
+}
+
+func (m *SRv6StructureSubSubTLV) GetArgumentLength() uint32 {
+	if m != nil {
+		return m.ArgumentLength
+	}
+	return 0
+}
+
+func (m *SRv6StructureSubSubTLV) GetTranspositionLength() uint32 {
+	if m != nil {
+		return m.TranspositionLength
+	}
+	return 0
+}
+
+func (m *SRv6StructureSubSubTLV) GetTranspositionOffset() uint32 {
+	if m != nil {
+		return m.TranspositionOffset
+	}
+	return 0
+}
+
+type SRv6SIDFlags struct {
+	// Placeholder for future sid flags
+	Flag_1 bool `protobuf:"varint,1,opt,name=flag_1,json=flag1" json:"flag_1,omitempty"`
+}
+
+func (m *SRv6SIDFlags) Reset()                    { *m = SRv6SIDFlags{} }
+func (m *SRv6SIDFlags) String() string            { return proto.CompactTextString(m) }
+func (*SRv6SIDFlags) ProtoMessage()               {}
+func (*SRv6SIDFlags) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{91} }
+
+func (m *SRv6SIDFlags) GetFlag_1() bool {
+	if m != nil {
+		return m.Flag_1
+	}
+	return false
+}
+
+type SRv6TLV struct {
+	Tlv []*google_protobuf.Any `protobuf:"bytes,1,rep,name=tlv" json:"tlv,omitempty"`
+}
+
+func (m *SRv6TLV) Reset()                    { *m = SRv6TLV{} }
+func (m *SRv6TLV) String() string            { return proto.CompactTextString(m) }
+func (*SRv6TLV) ProtoMessage()               {}
+func (*SRv6TLV) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{92} }
+
+func (m *SRv6TLV) GetTlv() []*google_protobuf.Any {
+	if m != nil {
+		return m.Tlv
+	}
+	return nil
+}
+
+// https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02#section-2.1.1
+type SRv6InformationSubTLV struct {
+	Sid              []byte        `protobuf:"bytes,1,opt,name=sid,proto3" json:"sid,omitempty"`
+	Flags            *SRv6SIDFlags `protobuf:"bytes,2,opt,name=flags" json:"flags,omitempty"`
+	EndpointBehavior uint32        `protobuf:"varint,3,opt,name=endpoint_behavior,json=endpointBehavior" json:"endpoint_behavior,omitempty"`
+	// SRv6TLV is one of:
+	// - SRv6StructureSubSubTLV
+	SubSubTlvs map[uint32]*SRv6TLV `protobuf:"bytes,4,rep,name=sub_sub_tlvs,json=subSubTlvs" json:"sub_sub_tlvs,omitempty" protobuf_key:"varint,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
+}
+
+func (m *SRv6InformationSubTLV) Reset()                    { *m = SRv6InformationSubTLV{} }
+func (m *SRv6InformationSubTLV) String() string            { return proto.CompactTextString(m) }
+func (*SRv6InformationSubTLV) ProtoMessage()               {}
+func (*SRv6InformationSubTLV) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{93} }
+
+func (m *SRv6InformationSubTLV) GetSid() []byte {
+	if m != nil {
+		return m.Sid
+	}
+	return nil
+}
+
+func (m *SRv6InformationSubTLV) GetFlags() *SRv6SIDFlags {
+	if m != nil {
+		return m.Flags
+	}
+	return nil
+}
+
+func (m *SRv6InformationSubTLV) GetEndpointBehavior() uint32 {
+	if m != nil {
+		return m.EndpointBehavior
+	}
+	return 0
+}
+
+func (m *SRv6InformationSubTLV) GetSubSubTlvs() map[uint32]*SRv6TLV {
+	if m != nil {
+		return m.SubSubTlvs
+	}
+	return nil
+}
+
+// https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02#section-2
+type SRv6L3ServiceTLV struct {
+	// SRv6TLV is one of:
+	// - SRv6InformationSubTLV
+	SubTlvs map[uint32]*SRv6TLV `protobuf:"bytes,1,rep,name=sub_tlvs,json=subTlvs" json:"sub_tlvs,omitempty" protobuf_key:"varint,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
+}
+
+func (m *SRv6L3ServiceTLV) Reset()                    { *m = SRv6L3ServiceTLV{} }
+func (m *SRv6L3ServiceTLV) String() string            { return proto.CompactTextString(m) }
+func (*SRv6L3ServiceTLV) ProtoMessage()               {}
+func (*SRv6L3ServiceTLV) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{94} }
+
+func (m *SRv6L3ServiceTLV) GetSubTlvs() map[uint32]*SRv6TLV {
+	if m != nil {
+		return m.SubTlvs
+	}
+	return nil
+}
+
+// https://tools.ietf.org/html/rfc8669
+type PrefixSID struct {
+	// tlv is one of:
+	// - IndexLabelTLV Type 1 (not yet implemented)
+	// - OriginatorSRGBTLV Type 3 (not yet implemented)
+	// - SRv6L3ServiceTLV Type 5
+	// - SRv6L2ServiceTLV Type 6 (not yet implemented)
+	Tlvs []*google_protobuf.Any `protobuf:"bytes,1,rep,name=tlvs" json:"tlvs,omitempty"`
+}
+
+func (m *PrefixSID) Reset()                    { *m = PrefixSID{} }
+func (m *PrefixSID) String() string            { return proto.CompactTextString(m) }
+func (*PrefixSID) ProtoMessage()               {}
+func (*PrefixSID) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{95} }
+
+func (m *PrefixSID) GetTlvs() []*google_protobuf.Any {
+	if m != nil {
+		return m.Tlvs
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*OriginAttribute)(nil), "gobgpapi.OriginAttribute")
 	proto.RegisterType((*AsSegment)(nil), "gobgpapi.AsSegment")
@@ -3003,202 +3183,227 @@ func init() {
 	proto.RegisterType((*LsAttributePrefix)(nil), "gobgpapi.LsAttributePrefix")
 	proto.RegisterType((*LsAttribute)(nil), "gobgpapi.LsAttribute")
 	proto.RegisterType((*UnknownAttribute)(nil), "gobgpapi.UnknownAttribute")
+	proto.RegisterType((*SRv6StructureSubSubTLV)(nil), "gobgpapi.SRv6StructureSubSubTLV")
+	proto.RegisterType((*SRv6SIDFlags)(nil), "gobgpapi.SRv6SIDFlags")
+	proto.RegisterType((*SRv6TLV)(nil), "gobgpapi.SRv6TLV")
+	proto.RegisterType((*SRv6InformationSubTLV)(nil), "gobgpapi.SRv6InformationSubTLV")
+	proto.RegisterType((*SRv6L3ServiceTLV)(nil), "gobgpapi.SRv6L3ServiceTLV")
+	proto.RegisterType((*PrefixSID)(nil), "gobgpapi.PrefixSID")
 	proto.RegisterEnum("gobgpapi.LsNLRIType", LsNLRIType_name, LsNLRIType_value)
 }
 
 func init() { proto.RegisterFile("attribute.proto", fileDescriptor0) }
 
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+	0x03, 0x1c, 0x9e, 0x2b, 0x0f, 0xb2, 0x98, 0x9d, 0xc3, 0xde, 0x12, 0x6c, 0xc6, 0xd3, 0xc2, 0x3f,
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+	0xd6, 0xd4, 0xcc, 0x72, 0xff, 0x76, 0xda, 0xc1, 0x54, 0xbc, 0x0f, 0xa1, 0x3d, 0x49, 0x42, 0x51,
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+	0xed, 0x27, 0x2a, 0x22, 0x0a, 0xeb, 0x3f, 0x31, 0x9f, 0xc0, 0x6d, 0xce, 0xc6, 0x6d, 0xf8, 0x05,
+	0x54, 0x58, 0x30, 0xbb, 0x36, 0x55, 0xe3, 0x0c, 0xe6, 0x7f, 0x95, 0xe1, 0x0e, 0x5f, 0x33, 0x08,
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+	0xd3, 0xf8, 0xb2, 0x18, 0xad, 0xd6, 0x33, 0xe8, 0xe4, 0x95, 0xd3, 0x50, 0x78, 0x0c, 0x2b, 0x28,
+	0xf4, 0xe2, 0x08, 0x87, 0xcc, 0x1e, 0xa3, 0x33, 0x67, 0x86, 0x55, 0x87, 0xbd, 0x69, 0x75, 0xf4,
+	0xc4, 0x33, 0x45, 0x37, 0x7e, 0x80, 0x06, 0x4f, 0xf3, 0x45, 0xaa, 0xcf, 0x53, 0xcc, 0x25, 0xa1,
+	0xf7, 0xd7, 0xc5, 0x1d, 0x2e, 0xe9, 0xb8, 0xad, 0x30, 0x13, 0xcc, 0xe8, 0x41, 0xc8, 0xc8, 0x85,
+	0x05, 0x34, 0x25, 0x6c, 0x1e, 0x43, 0x7b, 0x6e, 0x7a, 0x41, 0x01, 0xf8, 0x30, 0x9f, 0xf9, 0xd6,
+	0x77, 0x56, 0x8a, 0x1b, 0xf2, 0x5a, 0x46, 0xce, 0x7f, 0x57, 0xfe, 0x65, 0xc9, 0xfc, 0x8f, 0x12,
+	0x74, 0x38, 0x79, 0xf8, 0x74, 0x84, 0xc8, 0x0c, 0xbb, 0x88, 0x9b, 0xe9, 0x99, 0x2a, 0x50, 0xb2,
+	0xc4, 0xf8, 0x61, 0x51, 0x48, 0x9e, 0x7b, 0xbb, 0xa0, 0xad, 0xa8, 0x64, 0xb8, 0xaa, 0x87, 0xd0,
+	0xf8, 0x29, 0xf5, 0xfc, 0x06, 0x6a, 0xca, 0xbd, 0x0c, 0xf6, 0xdf, 0x3d, 0x69, 0x7f, 0x44, 0xc5,
+	0x0f, 0x1e, 0xd5, 0x73, 0x37, 0x56, 0xa1, 0x3d, 0x1c, 0xd9, 0x7c, 0x68, 0xbf, 0x3e, 0x7a, 0x79,
+	0xf4, 0xea, 0x37, 0x47, 0x9d, 0x3f, 0x32, 0x3a, 0xd0, 0xd0, 0xc4, 0xa3, 0x57, 0xfb, 0x07, 0x9d,
+	0x52, 0x9e, 0x32, 0x1c, 0x1c, 0xbd, 0xec, 0x94, 0x8d, 0x3b, 0xb0, 0xa2, 0x29, 0xc7, 0xd6, 0xc1,
+	0xf3, 0xc1, 0x5f, 0xd9, 0xa7, 0xbb, 0x9d, 0xca, 0x22, 0x72, 0xaf, 0xb3, 0x34, 0x5e, 0x16, 0x8a,
+	0x3c, 0xfd, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xfb, 0x60, 0xbf, 0x64, 0x89, 0x28, 0x00, 0x00,
 }
diff --git a/api/attribute.proto b/api/attribute.proto
index 11f075f1..acbffdf0 100644
--- a/api/attribute.proto
+++ b/api/attribute.proto
@@ -26,233 +26,214 @@ import "gobgp.proto";
 
 package gobgpapi;
 
-message OriginAttribute {
-    uint32 origin = 1;
-}
+message OriginAttribute { uint32 origin = 1; }
 
 message AsSegment {
-    uint32 type = 1;
-    repeated uint32 numbers = 2;
+  uint32 type = 1;
+  repeated uint32 numbers = 2;
 }
 
-message AsPathAttribute {
-    repeated AsSegment segments = 1;
-}
+message AsPathAttribute { repeated AsSegment segments = 1; }
 
-message NextHopAttribute {
-    string next_hop = 1;
-}
+message NextHopAttribute { string next_hop = 1; }
 
-message MultiExitDiscAttribute {
-    uint32 med = 1;
-}
+message MultiExitDiscAttribute { uint32 med = 1; }
 
-message LocalPrefAttribute {
-    uint32 local_pref = 1;
-}
+message LocalPrefAttribute { uint32 local_pref = 1; }
 
-message AtomicAggregateAttribute {
-}
+message AtomicAggregateAttribute {}
 
 message AggregatorAttribute {
-    uint32 as = 2;
-    string address = 3;
+  uint32 as = 2;
+  string address = 3;
 }
 
-message CommunitiesAttribute {
-    repeated uint32 communities = 1;
-}
+message CommunitiesAttribute { repeated uint32 communities = 1; }
 
-message OriginatorIdAttribute {
-    string id = 1;
-}
+message OriginatorIdAttribute { string id = 1; }
 
-message ClusterListAttribute {
-    repeated string ids = 1;
-}
+message ClusterListAttribute { repeated string ids = 1; }
 
 // IPAddressPrefix represents the NLRI for:
 // - AFI=1, SAFI=1
 // - AFI=2, SAFI=1
 message IPAddressPrefix {
-    uint32 prefix_len = 1;
-    string prefix = 2;
+  uint32 prefix_len = 1;
+  string prefix = 2;
 }
 
 // LabeledIPAddressPrefix represents the NLRI for:
 // - AFI=1, SAFI=4
 // - AFI=2, SAFI=4
 message LabeledIPAddressPrefix {
-    repeated uint32 labels = 1;
-    uint32 prefix_len = 2;
-    string prefix = 3;
+  repeated uint32 labels = 1;
+  uint32 prefix_len = 2;
+  string prefix = 3;
 }
 
 // EncapsulationNLRI represents the NLRI for:
 // - AFI=1, SAFI=7
 // - AFI=2, SAFI=7
-message EncapsulationNLRI {
-    string address = 1;
-}
+message EncapsulationNLRI { string address = 1; }
 
 message RouteDistinguisherTwoOctetAS {
-    uint32 admin = 1;
-    uint32 assigned = 2;
+  uint32 admin = 1;
+  uint32 assigned = 2;
 }
 
 message RouteDistinguisherIPAddress {
-    string admin = 1;
-    uint32 assigned = 2;
+  string admin = 1;
+  uint32 assigned = 2;
 }
 
 message RouteDistinguisherFourOctetAS {
-    uint32 admin = 1;
-    uint32 assigned = 2;
+  uint32 admin = 1;
+  uint32 assigned = 2;
 }
 
 message EthernetSegmentIdentifier {
-    uint32 type = 1;
-    bytes value = 2;
+  uint32 type = 1;
+  bytes value = 2;
 }
 
 // EVPNEthernetAutoDiscoveryRoute represents the NLRI for:
 // - AFI=25, SAFI=70, RouteType=1
 message EVPNEthernetAutoDiscoveryRoute {
-    // One of:
-    // - RouteDistinguisherTwoOctetAS
-    // - RouteDistinguisherIPAddressAS
-    // - RouteDistinguisherFourOctetAS
-    google.protobuf.Any rd = 1;
-    EthernetSegmentIdentifier esi = 2;
-    uint32 ethernet_tag = 3;
-    uint32 label = 4;
+  // One of:
+  // - RouteDistinguisherTwoOctetAS
+  // - RouteDistinguisherIPAddressAS
+  // - RouteDistinguisherFourOctetAS
+  google.protobuf.Any rd = 1;
+  EthernetSegmentIdentifier esi = 2;
+  uint32 ethernet_tag = 3;
+  uint32 label = 4;
 }
 
 // EVPNMACIPAdvertisementRoute represents the NLRI for:
 // - AFI=25, SAFI=70, RouteType=2
 message EVPNMACIPAdvertisementRoute {
-    // One of:
-    // - RouteDistinguisherTwoOctetAS
-    // - RouteDistinguisherIPAddressAS
-    // - RouteDistinguisherFourOctetAS
-    google.protobuf.Any rd = 1;
-    EthernetSegmentIdentifier esi = 2;
-    uint32 ethernet_tag = 3;
-    string mac_address = 4;
-    string ip_address = 5;
-    repeated uint32 labels = 6;
+  // One of:
+  // - RouteDistinguisherTwoOctetAS
+  // - RouteDistinguisherIPAddressAS
+  // - RouteDistinguisherFourOctetAS
+  google.protobuf.Any rd = 1;
+  EthernetSegmentIdentifier esi = 2;
+  uint32 ethernet_tag = 3;
+  string mac_address = 4;
+  string ip_address = 5;
+  repeated uint32 labels = 6;
 }
 
 // EVPNInclusiveMulticastEthernetTagRoute represents the NLRI for:
 // - AFI=25, SAFI=70, RouteType=3
 message EVPNInclusiveMulticastEthernetTagRoute {
-    // One of:
-    // - RouteDistinguisherTwoOctetAS
-    // - RouteDistinguisherIPAddressAS
-    // - RouteDistinguisherFourOctetAS
-    google.protobuf.Any rd = 1;
-    uint32 ethernet_tag = 2;
-    string ip_address = 3;
+  // One of:
+  // - RouteDistinguisherTwoOctetAS
+  // - RouteDistinguisherIPAddressAS
+  // - RouteDistinguisherFourOctetAS
+  google.protobuf.Any rd = 1;
+  uint32 ethernet_tag = 2;
+  string ip_address = 3;
 }
 
 // EVPNEthernetSegmentRoute represents the NLRI for:
 // - AFI=25, SAFI=70, RouteType=4
 message EVPNEthernetSegmentRoute {
-    // One of:
-    // - RouteDistinguisherTwoOctetAS
-    // - RouteDistinguisherIPAddressAS
-    // - RouteDistinguisherFourOctetAS
-    google.protobuf.Any rd = 1;
-    EthernetSegmentIdentifier esi = 2;
-    string ip_address = 3;
+  // One of:
+  // - RouteDistinguisherTwoOctetAS
+  // - RouteDistinguisherIPAddressAS
+  // - RouteDistinguisherFourOctetAS
+  google.protobuf.Any rd = 1;
+  EthernetSegmentIdentifier esi = 2;
+  string ip_address = 3;
 }
 
 // EVPNIPPrefixRoute represents the NLRI for:
 // - AFI=25, SAFI=70, RouteType=5
 message EVPNIPPrefixRoute {
-    // One of:
-    // - RouteDistinguisherTwoOctetAS
-    // - RouteDistinguisherIPAddressAS
-    // - RouteDistinguisherFourOctetAS
-    google.protobuf.Any rd = 1;
-    EthernetSegmentIdentifier esi = 2;
-    uint32 ethernet_tag = 3;
-    string ip_prefix = 4;
-    uint32 ip_prefix_len = 5;
-    string gw_address = 6;
-    uint32 label = 7;
+  // One of:
+  // - RouteDistinguisherTwoOctetAS
+  // - RouteDistinguisherIPAddressAS
+  // - RouteDistinguisherFourOctetAS
+  google.protobuf.Any rd = 1;
+  EthernetSegmentIdentifier esi = 2;
+  uint32 ethernet_tag = 3;
+  string ip_prefix = 4;
+  uint32 ip_prefix_len = 5;
+  string gw_address = 6;
+  uint32 label = 7;
 }
 
 // EVPNIPMSIRoute represents the NLRI for:
 // - AFI=25, SAFI=70, RouteType=9
 message EVPNIPMSIRoute {
-    // One of:
-    // - RouteDistinguisherTwoOctetAS
-    // - RouteDistinguisherIPAddressAS
-    // - RouteDistinguisherFourOctetAS
-    google.protobuf.Any rd = 1;
-    uint32 ethernet_tag = 2;
-    google.protobuf.Any rt = 3;
+  // One of:
+  // - RouteDistinguisherTwoOctetAS
+  // - RouteDistinguisherIPAddressAS
+  // - RouteDistinguisherFourOctetAS
+  google.protobuf.Any rd = 1;
+  uint32 ethernet_tag = 2;
+  google.protobuf.Any rt = 3;
 }
 
 // LabeledVPNIPAddressPrefix represents the NLRI for:
 // - AFI=1, SAFI=128
 // - AFI=2, SAFI=128
 message LabeledVPNIPAddressPrefix {
-    repeated uint32 labels = 1;
-    // One of:
-    // - TwoOctetAsSpecificExtended
-    // - IPv4AddressSpecificExtended
-    // - FourOctetAsSpecificExtended
-    google.protobuf.Any rd = 2;
-    uint32 prefix_len = 3;
-    string prefix = 4;
+  repeated uint32 labels = 1;
+  // One of:
+  // - TwoOctetAsSpecificExtended
+  // - IPv4AddressSpecificExtended
+  // - FourOctetAsSpecificExtended
+  google.protobuf.Any rd = 2;
+  uint32 prefix_len = 3;
+  string prefix = 4;
 }
 
 // RouteTargetMembershipNLRI represents the NLRI for:
 // - AFI=1, SAFI=132
 message RouteTargetMembershipNLRI {
-    uint32 as = 1;
-    // One of:
-    // - TwoOctetAsSpecificExtended
-    // - IPv4AddressSpecificExtended
-    // - FourOctetAsSpecificExtended
-    google.protobuf.Any rt = 2;
+  uint32 as = 1;
+  // One of:
+  // - TwoOctetAsSpecificExtended
+  // - IPv4AddressSpecificExtended
+  // - FourOctetAsSpecificExtended
+  google.protobuf.Any rt = 2;
 }
 
 message FlowSpecIPPrefix {
-    uint32 type = 1;
-    uint32 prefix_len = 2;
-    string prefix = 3;
-    // IPv6 only
-    uint32 offset = 4;
+  uint32 type = 1;
+  uint32 prefix_len = 2;
+  string prefix = 3;
+  // IPv6 only
+  uint32 offset = 4;
 }
 
 message FlowSpecMAC {
-    uint32 type = 1;
-    string address = 2;
+  uint32 type = 1;
+  string address = 2;
 }
 
 message FlowSpecComponentItem {
-    // Operator for Numeric type, Operand for Bitmask type
-    uint32 op = 1;
-    uint64 value = 2;
+  // Operator for Numeric type, Operand for Bitmask type
+  uint32 op = 1;
+  uint64 value = 2;
 }
 
 message FlowSpecComponent {
-    uint32 type = 1;
-    repeated FlowSpecComponentItem items = 2;
+  uint32 type = 1;
+  repeated FlowSpecComponentItem items = 2;
 }
 
 // FlowSpecNLRI represents the NLRI for:
 // - AFI=1, SAFI=133
 // - AFI=2, SAFI=133
 message FlowSpecNLRI {
-    // One of:
-    // - FlowSpecIPPrefix
-    // - FlowSpecMAC
-    // - FlowSpecComponent
-    repeated google.protobuf.Any rules = 1;
+  // One of:
+  // - FlowSpecIPPrefix
+  // - FlowSpecMAC
+  // - FlowSpecComponent
+  repeated google.protobuf.Any rules = 1;
 }
 
 // VPNFlowSpecNLRI represents the NLRI for:
@@ -260,399 +241,414 @@ message FlowSpecNLRI {
 // - AFI=2, SAFI=134
 // - AFI=25, SAFI=134
 message VPNFlowSpecNLRI {
-    // One of:
-    // - RouteDistinguisherTwoOctetAS
-    // - RouteDistinguisherIPAddressAS
-    // - RouteDistinguisherFourOctetAS
-    google.protobuf.Any rd = 1;
-    // One of:
-    // - FlowSpecIPPrefix
-    // - FlowSpecMAC
-    // - FlowSpecComponent
-    repeated google.protobuf.Any rules = 2;
+  // One of:
+  // - RouteDistinguisherTwoOctetAS
+  // - RouteDistinguisherIPAddressAS
+  // - RouteDistinguisherFourOctetAS
+  google.protobuf.Any rd = 1;
+  // One of:
+  // - FlowSpecIPPrefix
+  // - FlowSpecMAC
+  // - FlowSpecComponent
+  repeated google.protobuf.Any rules = 2;
 }
 
 // OpaqueNLRI represents the NLRI for:
 // - AFI=16397, SAFI=241
 message OpaqueNLRI {
-    bytes key = 1;
-    bytes value = 2;
+  bytes key = 1;
+  bytes value = 2;
 }
 
 message LsNodeDescriptor {
-    uint32 asn = 1;
-    uint32 bgp_ls_id = 2;
-    uint32 ospf_area_id = 3;
-    bool pseudonode = 4;
-    string igp_router_id = 5;
+  uint32 asn = 1;
+  uint32 bgp_ls_id = 2;
+  uint32 ospf_area_id = 3;
+  bool pseudonode = 4;
+  string igp_router_id = 5;
 }
 
 message LsLinkDescriptor {
-    uint32 link_local_id = 1;
-    uint32 link_remote_id = 2;
-    string interface_addr_ipv4 = 3;
-    string neighbor_addr_ipv4 = 4;
-    string interface_addr_ipv6 = 5;
-    string neighbor_addr_ipv6 = 6;
+  uint32 link_local_id = 1;
+  uint32 link_remote_id = 2;
+  string interface_addr_ipv4 = 3;
+  string neighbor_addr_ipv4 = 4;
+  string interface_addr_ipv6 = 5;
+  string neighbor_addr_ipv6 = 6;
 }
 
 message LsPrefixDescriptor {
-    repeated string ip_reachability = 1;
-    string ospf_route_type = 2;
+  repeated string ip_reachability = 1;
+  string ospf_route_type = 2;
 }
 
-message LsNodeNLRI {
-    LsNodeDescriptor local_node = 1;
-}
+message LsNodeNLRI { LsNodeDescriptor local_node = 1; }
 
 message LsLinkNLRI {
-    LsNodeDescriptor local_node = 1;
-    LsNodeDescriptor remote_node = 2;
-    LsLinkDescriptor link_descriptor = 3;
+  LsNodeDescriptor local_node = 1;
+  LsNodeDescriptor remote_node = 2;
+  LsLinkDescriptor link_descriptor = 3;
 }
 
 message LsPrefixV4NLRI {
-    LsNodeDescriptor local_node = 1;
-    LsPrefixDescriptor prefix_descriptor = 2;
+  LsNodeDescriptor local_node = 1;
+  LsPrefixDescriptor prefix_descriptor = 2;
 }
 
 message LsPrefixV6NLRI {
-    LsNodeDescriptor local_node = 1;
-    LsPrefixDescriptor prefix_descriptor = 2;
+  LsNodeDescriptor local_node = 1;
+  LsPrefixDescriptor prefix_descriptor = 2;
 }
 
 // Based om RFC 7752, Table 1.
 enum LsNLRIType {
-    LS_NLRI_UNKNOWN = 0;
-    LS_NLRI_NODE = 1;
-    LS_NLRI_LINK = 2;
-    LS_NLRI_PREFIX_V4 = 3;
-    LS_NLRI_PREFIX_V6 = 4;
+  LS_NLRI_UNKNOWN = 0;
+  LS_NLRI_NODE = 1;
+  LS_NLRI_LINK = 2;
+  LS_NLRI_PREFIX_V4 = 3;
+  LS_NLRI_PREFIX_V6 = 4;
 }
 
 // LsAddrPrefix represents the NLRI for:
 // - AFI=16388, SAFI=71
 message LsAddrPrefix {
-    LsNLRIType type = 1;
-    // One of:
-    // - LsNodeNLRI
-    // - LsLinkNLRI
-    // - LsPrefixV4NLRI
-    // - LsPrefixV6NLRI
-    google.protobuf.Any nlri = 2;
+  LsNLRIType type = 1;
+  // One of:
+  // - LsNodeNLRI
+  // - LsLinkNLRI
+  // - LsPrefixV4NLRI
+  // - LsPrefixV6NLRI
+  google.protobuf.Any nlri = 2;
 }
 
 message MpReachNLRIAttribute {
-    gobgpapi.Family family = 1;
-    repeated string next_hops = 2;
-    // Each NLRI must be one of:
-    // - IPAddressPrefix
-    // - LabeledIPAddressPrefix
-    // - EncapsulationNLRI
-    // - EVPNEthernetAutoDiscoveryRoute
-    // - EVPNMACIPAdvertisementRoute
-    // - EVPNInclusiveMulticastEthernetTagRoute
-    // - EVPNEthernetSegmentRoute
-    // - EVPNIPPrefixRoute
-    // - EVPNIPMSIRoute
-    // - LabeledVPNIPAddressPrefix
-    // - RouteTargetMembershipNLRI
-    // - FlowSpecNLRI
-    // - VPNFlowSpecNLRI
-    // - OpaqueNLRI
-    // - LsAddrPrefix
-    repeated google.protobuf.Any nlris = 3;
+  gobgpapi.Family family = 1;
+  repeated string next_hops = 2;
+  // Each NLRI must be one of:
+  // - IPAddressPrefix
+  // - LabeledIPAddressPrefix
+  // - EncapsulationNLRI
+  // - EVPNEthernetAutoDiscoveryRoute
+  // - EVPNMACIPAdvertisementRoute
+  // - EVPNInclusiveMulticastEthernetTagRoute
+  // - EVPNEthernetSegmentRoute
+  // - EVPNIPPrefixRoute
+  // - EVPNIPMSIRoute
+  // - LabeledVPNIPAddressPrefix
+  // - RouteTargetMembershipNLRI
+  // - FlowSpecNLRI
+  // - VPNFlowSpecNLRI
+  // - OpaqueNLRI
+  // - LsAddrPrefix
+  repeated google.protobuf.Any nlris = 3;
 }
 
 message MpUnreachNLRIAttribute {
-    gobgpapi.Family family = 1;
-    // The same as NLRI field of MpReachNLRIAttribute
-    repeated google.protobuf.Any nlris = 3;
+  gobgpapi.Family family = 1;
+  // The same as NLRI field of MpReachNLRIAttribute
+  repeated google.protobuf.Any nlris = 3;
 }
 
 message TwoOctetAsSpecificExtended {
-    bool is_transitive = 1;
-    uint32 sub_type = 2;
-    uint32 as = 3;
-    uint32 local_admin = 4;
+  bool is_transitive = 1;
+  uint32 sub_type = 2;
+  uint32 as = 3;
+  uint32 local_admin = 4;
 }
 
 message IPv4AddressSpecificExtended {
-    bool is_transitive = 1;
-    uint32 sub_type = 2;
-    string address = 3;
-    uint32 local_admin = 4;
+  bool is_transitive = 1;
+  uint32 sub_type = 2;
+  string address = 3;
+  uint32 local_admin = 4;
 }
 
 message FourOctetAsSpecificExtended {
-    bool is_transitive = 1;
-    uint32 sub_type = 2;
-    uint32 as = 3;
-    uint32 local_admin = 4;
+  bool is_transitive = 1;
+  uint32 sub_type = 2;
+  uint32 as = 3;
+  uint32 local_admin = 4;
 }
 
-message ValidationExtended {
-    uint32 state = 1;
-}
+message ValidationExtended { uint32 state = 1; }
 
-message ColorExtended {
-    uint32 color = 1;
-}
+message ColorExtended { uint32 color = 1; }
 
-message EncapExtended {
-    uint32 tunnel_type = 1;
-}
+message EncapExtended { uint32 tunnel_type = 1; }
 
-message DefaultGatewayExtended {
-}
+message DefaultGatewayExtended {}
 
 message OpaqueExtended {
-    bool is_transitive = 1;
-    bytes value = 3;
+  bool is_transitive = 1;
+  bytes value = 3;
 }
 
 message ESILabelExtended {
-    bool is_single_active = 1;
-    uint32 label = 2;
+  bool is_single_active = 1;
+  uint32 label = 2;
 }
 
-message ESImportRouteTarget {
-    string es_import = 1;
-}
+message ESImportRouteTarget { string es_import = 1; }
 
 message MacMobilityExtended {
-    bool is_sticky = 1;
-    uint32 sequence_num = 2;
+  bool is_sticky = 1;
+  uint32 sequence_num = 2;
 }
 
-message RouterMacExtended {
-    string mac = 1;
-}
+message RouterMacExtended { string mac = 1; }
 
 message TrafficRateExtended {
-    uint32 as = 1;
-    float rate = 2;
+  uint32 as = 1;
+  float rate = 2;
 }
 
 message TrafficActionExtended {
-    bool terminal = 1;
-    bool sample = 2;
+  bool terminal = 1;
+  bool sample = 2;
 }
 
 message RedirectTwoOctetAsSpecificExtended {
-    uint32 as = 1;
-    uint32 local_admin = 2;
+  uint32 as = 1;
+  uint32 local_admin = 2;
 }
 
 message RedirectIPv4AddressSpecificExtended {
-    string address = 1;
-    uint32 local_admin = 2;
+  string address = 1;
+  uint32 local_admin = 2;
 }
 
 message RedirectFourOctetAsSpecificExtended {
-    uint32 as = 1;
-    uint32 local_admin = 2;
+  uint32 as = 1;
+  uint32 local_admin = 2;
 }
 
-message TrafficRemarkExtended {
-    uint32 dscp = 1;
-}
+message TrafficRemarkExtended { uint32 dscp = 1; }
 
 message UnknownExtended {
-    uint32 type = 1;
-    bytes value = 2;
+  uint32 type = 1;
+  bytes value = 2;
 }
 
 message ExtendedCommunitiesAttribute {
-    // Each Community must be one of:
-    // - TwoOctetAsSpecificExtended
-    // - IPv4AddressSpecificExtended
-    // - FourOctetAsSpecificExtended
-    // - OpaqueExtended
-    // - ESILabelExtended
-    // - MacMobilityExtended
-    // - RouterMacExtended
-    // - TrafficRateExtended
-    // - TrafficActionExtended
-    // - RedirectTwoOctetAsSpecificExtended
-    // - RedirectIPv4AddressSpecificExtended
-    // - RedirectFourOctetAsSpecificExtended
-    // - TrafficRemarkExtended
-    // - UnknownExtended
-    repeated google.protobuf.Any communities = 1;
-}
-
-message As4PathAttribute {
-    repeated AsSegment segments = 1;
-}
+  // Each Community must be one of:
+  // - TwoOctetAsSpecificExtended
+  // - IPv4AddressSpecificExtended
+  // - FourOctetAsSpecificExtended
+  // - OpaqueExtended
+  // - ESILabelExtended
+  // - MacMobilityExtended
+  // - RouterMacExtended
+  // - TrafficRateExtended
+  // - TrafficActionExtended
+  // - RedirectTwoOctetAsSpecificExtended
+  // - RedirectIPv4AddressSpecificExtended
+  // - RedirectFourOctetAsSpecificExtended
+  // - TrafficRemarkExtended
+  // - UnknownExtended
+  repeated google.protobuf.Any communities = 1;
+}
+
+message As4PathAttribute { repeated AsSegment segments = 1; }
 
 message As4AggregatorAttribute {
-    uint32 as = 2;
-    string address = 3;
+  uint32 as = 2;
+  string address = 3;
 }
 
 message PmsiTunnelAttribute {
-    uint32 flags = 1;
-    uint32 type = 2;
-    uint32 label = 3;
-    bytes id = 4;
+  uint32 flags = 1;
+  uint32 type = 2;
+  uint32 label = 3;
+  bytes id = 4;
 }
 
 message TunnelEncapSubTLVEncapsulation {
-    uint32 key = 1;
-    bytes cookie = 2;
+  uint32 key = 1;
+  bytes cookie = 2;
 }
 
-message TunnelEncapSubTLVProtocol {
-    uint32 protocol = 1;
-}
+message TunnelEncapSubTLVProtocol { uint32 protocol = 1; }
 
-message TunnelEncapSubTLVColor {
-    uint32 color = 1;
-}
+message TunnelEncapSubTLVColor { uint32 color = 1; }
 
 message TunnelEncapSubTLVUnknown {
-    uint32 type = 1;
-    bytes value = 2;
+  uint32 type = 1;
+  bytes value = 2;
 }
 
 message TunnelEncapTLV {
-    uint32 type = 1;
-    // Each TLV must be one of:
-    // - TunnelEncapSubTLVEncapsulation
-    // - TunnelEncapSubTLVProtocol
-    // - TunnelEncapSubTLVColor
-    // - TunnelEncapSubTLVUnknown
-    repeated google.protobuf.Any tlvs = 2;
+  uint32 type = 1;
+  // Each TLV must be one of:
+  // - TunnelEncapSubTLVEncapsulation
+  // - TunnelEncapSubTLVProtocol
+  // - TunnelEncapSubTLVColor
+  // - TunnelEncapSubTLVUnknown
+  repeated google.protobuf.Any tlvs = 2;
 }
 
-message TunnelEncapAttribute {
-    repeated TunnelEncapTLV tlvs = 1;
-}
+message TunnelEncapAttribute { repeated TunnelEncapTLV tlvs = 1; }
 
 message IPv6AddressSpecificExtended {
-    bool is_transitive = 1;
-    uint32 sub_type = 2;
-    string address = 3;
-    uint32 local_admin = 4;
+  bool is_transitive = 1;
+  uint32 sub_type = 2;
+  string address = 3;
+  uint32 local_admin = 4;
 }
 
 message RedirectIPv6AddressSpecificExtended {
-    string address = 1;
-    uint32 local_admin = 2;
+  string address = 1;
+  uint32 local_admin = 2;
 }
 
 message IP6ExtendedCommunitiesAttribute {
-    // Each Community must be one of:
-    // - IPv6AddressSpecificExtended
-    // - RedirectIPv6AddressSpecificExtended
-    repeated google.protobuf.Any communities = 1;
+  // Each Community must be one of:
+  // - IPv6AddressSpecificExtended
+  // - RedirectIPv6AddressSpecificExtended
+  repeated google.protobuf.Any communities = 1;
 }
 
-message AigpTLVIGPMetric {
-    uint64 metric = 1;
-}
+message AigpTLVIGPMetric { uint64 metric = 1; }
 
 message AigpTLVUnknown {
-    uint32 type = 1;
-    bytes value = 2;
+  uint32 type = 1;
+  bytes value = 2;
 }
 
 message AigpAttribute {
-    // Each TLV must be one of:
-    // - AigpTLVIGPMetric
-    // - AigpTLVUnknown
-    repeated google.protobuf.Any tlvs = 1;
+  // Each TLV must be one of:
+  // - AigpTLVIGPMetric
+  // - AigpTLVUnknown
+  repeated google.protobuf.Any tlvs = 1;
 }
 
 message LargeCommunity {
-    uint32 global_admin = 1;
-    uint32 local_data1 = 2;
-    uint32 local_data2 = 3;
+  uint32 global_admin = 1;
+  uint32 local_data1 = 2;
+  uint32 local_data2 = 3;
 }
 
-message LargeCommunitiesAttribute {
-    repeated LargeCommunity communities = 1;
-}
+message LargeCommunitiesAttribute { repeated LargeCommunity communities = 1; }
 
 message LsNodeFlags {
-    bool overload = 1;
-    bool attached = 2;
-    bool external = 3;
-    bool abr = 4;
-    bool router = 5;
-    bool v6 = 6;
+  bool overload = 1;
+  bool attached = 2;
+  bool external = 3;
+  bool abr = 4;
+  bool router = 5;
+  bool v6 = 6;
 }
 
 message LsIGPFlags {
-    bool down = 1;
-    bool no_unicast = 2;
-    bool local_address = 3;
-    bool propagate_nssa = 4;
+  bool down = 1;
+  bool no_unicast = 2;
+  bool local_address = 3;
+  bool propagate_nssa = 4;
 }
 
 message LsSrRange {
-    uint32 begin = 1;
-    uint32 end = 2;
+  uint32 begin = 1;
+  uint32 end = 2;
 }
 
 message LsSrCapabilities {
-    bool ipv4_supported = 1;
-    bool ipv6_supported = 2;
-    repeated LsSrRange ranges = 3;
+  bool ipv4_supported = 1;
+  bool ipv6_supported = 2;
+  repeated LsSrRange ranges = 3;
 }
 
-message LsSrLocalBlock {
-    repeated LsSrRange ranges = 1;
-}
+message LsSrLocalBlock { repeated LsSrRange ranges = 1; }
 
 message LsAttributeNode {
-    string name = 1;
-    LsNodeFlags flags = 2;
-    string local_router_id = 3;
-    string local_router_id_v6 = 4;
-    bytes isis_area = 5;
-    bytes opaque = 6;
+  string name = 1;
+  LsNodeFlags flags = 2;
+  string local_router_id = 3;
+  string local_router_id_v6 = 4;
+  bytes isis_area = 5;
+  bytes opaque = 6;
 
-    LsSrCapabilities sr_capabilities = 7;
-    bytes sr_algorithms = 8;
-    LsSrLocalBlock sr_local_block = 9;
+  LsSrCapabilities sr_capabilities = 7;
+  bytes sr_algorithms = 8;
+  LsSrLocalBlock sr_local_block = 9;
 }
 
 message LsAttributeLink {
-    string name = 1;
-    string local_router_id = 2;
-    string local_router_id_v6 = 3;
-    string remote_router_id = 4;
-    string remote_router_id_v6 = 5;
-    uint32 admin_group = 6;
-    uint32 default_te_metric = 7;
-    uint32 igp_metric = 8;
-    bytes opaque = 9;
+  string name = 1;
+  string local_router_id = 2;
+  string local_router_id_v6 = 3;
+  string remote_router_id = 4;
+  string remote_router_id_v6 = 5;
+  uint32 admin_group = 6;
+  uint32 default_te_metric = 7;
+  uint32 igp_metric = 8;
+  bytes opaque = 9;
 
-    float bandwidth = 10;
-    float reservable_bandwidth = 11;
-    repeated float unreserved_bandwidth = 12;
+  float bandwidth = 10;
+  float reservable_bandwidth = 11;
+  repeated float unreserved_bandwidth = 12;
 
-    uint32 sr_adjacency_sid = 13;
-    repeated uint32 srlgs = 14;
+  uint32 sr_adjacency_sid = 13;
+  repeated uint32 srlgs = 14;
 }
 
 message LsAttributePrefix {
-    LsIGPFlags igp_flags = 1;
-    bytes opaque = 2;
+  LsIGPFlags igp_flags = 1;
+  bytes opaque = 2;
 
-    uint32 sr_prefix_sid = 3;
+  uint32 sr_prefix_sid = 3;
 }
 
 message LsAttribute {
-    LsAttributeNode node = 1;
-    LsAttributeLink link = 2;
-    LsAttributePrefix prefix = 3;
+  LsAttributeNode node = 1;
+  LsAttributeLink link = 2;
+  LsAttributePrefix prefix = 3;
 }
 
 message UnknownAttribute {
-    uint32 flags = 1;
-    uint32 type = 2;
-    bytes value = 3;
-}
+  uint32 flags = 1;
+  uint32 type = 2;
+  bytes value = 3;
+}
+
+// https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02#section-2.1.1
+message SRv6StructureSubSubTLV {
+  uint32 local_block_length = 1;
+  uint32 local_node_length = 2;
+  uint32 function_length = 3;
+  uint32 argument_length = 4;
+  uint32 transposition_length = 5;
+  uint32 transposition_offset = 6;
+}
+
+message SRv6SIDFlags {
+  // Placeholder for future sid flags
+  bool flag_1 = 1;
+}
+
+message SRv6TLV { repeated google.protobuf.Any tlv = 1; }
+
+// https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02#section-2.1.1
+message SRv6InformationSubTLV {
+  bytes sid = 1;
+  SRv6SIDFlags flags = 2;
+  uint32 endpoint_behavior = 3;
+  // SRv6TLV is one of:
+  // - SRv6StructureSubSubTLV
+  map<uint32, SRv6TLV> sub_sub_tlvs = 4;
+}
+
+// https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02#section-2
+message SRv6L3ServiceTLV {
+  // SRv6TLV is one of:
+  // - SRv6InformationSubTLV
+  map<uint32, SRv6TLV> sub_tlvs = 1;
+}
+
+// https://tools.ietf.org/html/rfc8669
+message PrefixSID {
+  // tlv is one of:
+  // - IndexLabelTLV Type 1 (not yet implemented)
+  // - OriginatorSRGBTLV Type 3 (not yet implemented)
+  // - SRv6L3ServiceTLV Type 5
+  // - SRv6L2ServiceTLV Type 6 (not yet implemented)
+  repeated google.protobuf.Any tlvs = 1;
+}
\ No newline at end of file
diff --git a/internal/pkg/apiutil/attribute.go b/internal/pkg/apiutil/attribute.go
index 1610a181..8422f3f3 100644
--- a/internal/pkg/apiutil/attribute.go
+++ b/internal/pkg/apiutil/attribute.go
@@ -75,6 +75,8 @@ func UnmarshalAttribute(an *any.Any) (bgp.PathAttributeInterface, error) {
 			}
 		}
 		return bgp.NewPathAttributeClusterList(a.Ids), nil
+	case *api.PrefixSID:
+		return bgp.NewPathAttributePrefixSID(a)
 	}
 	return nil, errors.New("unexpected object")
 }
@@ -149,6 +151,114 @@ func NewClusterListAttributeFromNative(a *bgp.PathAttributeClusterList) *api.Clu
 	}
 }
 
+func NewPrefixSIDAttributeFromNative(a *bgp.PathAttributePrefixSID) *api.PrefixSID {
+	psid := &api.PrefixSID{}
+	psid.Tlvs = MarshalSRv6TLVs(a.TLVs)
+
+	return psid
+}
+
+func MarshalSRv6TLVs(tlvs []bgp.PrefixSIDTLVInterface) []*any.Any {
+	mtlvs := make([]*any.Any, len(tlvs))
+	for i, tlv := range tlvs {
+		var r proto.Message
+		switch t := tlv.(type) {
+		case *bgp.SRv6L3ServiceAttribute:
+			o := &api.SRv6L3ServiceTLV{}
+			o.SubTlvs = MarshalSRv6SubTLVs(t.SubTLVs)
+			r = o
+		default:
+			log.WithFields(log.Fields{
+				"Topic": "protobuf",
+				"SRv6":  t,
+			}).Warn("invalid prefix sid tlv type to marshal")
+			return nil
+		}
+		a, _ := ptypes.MarshalAny(r)
+		mtlvs[i] = a
+	}
+
+	return mtlvs
+}
+
+func MarshalSRv6SubTLVs(tlvs []bgp.PrefixSIDTLVInterface) map[uint32]*api.SRv6TLV {
+	mtlvs := make(map[uint32]*api.SRv6TLV)
+	var key uint32
+	for _, tlv := range tlvs {
+		var r proto.Message
+		switch t := tlv.(type) {
+		case *bgp.SRv6InformationSubTLV:
+			o := &api.SRv6InformationSubTLV{
+				EndpointBehavior: uint32(t.EndpointBehavior),
+				// TODO Once flags are used in RFC, add processing.
+				Flags: &api.SRv6SIDFlags{},
+			}
+			o.Sid = make([]byte, len(t.SID))
+			copy(o.Sid, t.SID)
+			o.SubSubTlvs = MarshalSRv6SubSubTLVs(t.SubSubTLVs)
+			// SRv6 Information Sub TLV is type 1 Sub TLV
+			key = 1
+			r = o
+		default:
+			log.WithFields(log.Fields{
+				"Topic": "protobuf",
+				"SRv6":  t,
+			}).Warn("invalid prefix sid sub tlv type to marshal")
+			return nil
+		}
+		a, _ := ptypes.MarshalAny(r)
+		tlvs, ok := mtlvs[key]
+		if !ok {
+			tlvs = &api.SRv6TLV{
+				Tlv: make([]*any.Any, 0),
+			}
+			mtlvs[key] = tlvs
+		}
+		tlvs.Tlv = append(tlvs.Tlv, a)
+	}
+
+	return mtlvs
+}
+
+func MarshalSRv6SubSubTLVs(tlvs []bgp.PrefixSIDTLVInterface) map[uint32]*api.SRv6TLV {
+	mtlvs := make(map[uint32]*api.SRv6TLV)
+	var key uint32
+	for _, tlv := range tlvs {
+		var r proto.Message
+		switch t := tlv.(type) {
+		case *bgp.SRv6SIDStructureSubSubTLV:
+			o := &api.SRv6StructureSubSubTLV{
+				LocalBlockLength:    uint32(t.LocalBlockLength),
+				LocalNodeLength:     uint32(t.LocatorNodeLength),
+				FunctionLength:      uint32(t.FunctionLength),
+				ArgumentLength:      uint32(t.ArgumentLength),
+				TranspositionLength: uint32(t.TranspositionLength),
+				TranspositionOffset: uint32(t.TranspositionOffset),
+			}
+			// SRv6 SID Structure Sub Sub TLV is type 1 Sub Sub TLV
+			key = 1
+			r = o
+		default:
+			log.WithFields(log.Fields{
+				"Topic": "protobuf",
+				"SRv6":  t,
+			}).Warn("invalid prefix sid sub sub tlv type to marshal")
+			return nil
+		}
+		a, _ := ptypes.MarshalAny(r)
+		tlvs, ok := mtlvs[key]
+		if !ok {
+			tlvs = &api.SRv6TLV{
+				Tlv: make([]*any.Any, 0),
+			}
+			mtlvs[key] = tlvs
+		}
+		tlvs.Tlv = append(tlvs.Tlv, a)
+	}
+
+	return mtlvs
+}
+
 func MarshalRD(rd bgp.RouteDistinguisherInterface) *any.Any {
 	var r proto.Message
 	switch v := rd.(type) {
@@ -1537,7 +1647,8 @@ func unmarshalAttribute(an *any.Any) (bgp.PathAttributeInterface, error) {
 			communities = append(communities, bgp.NewLargeCommunity(c.GlobalAdmin, c.LocalData1, c.LocalData2))
 		}
 		return bgp.NewPathAttributeLargeCommunities(communities), nil
-
+	case *api.PrefixSID:
+		return bgp.NewPathAttributePrefixSID(a)
 	case *api.UnknownAttribute:
 		return bgp.NewPathAttributeUnknown(bgp.BGPAttrFlag(a.Flags), bgp.BGPAttrType(a.Type), a.Value), nil
 	}
diff --git a/internal/pkg/apiutil/attribute_test.go b/internal/pkg/apiutil/attribute_test.go
index 8b3cd1c2..a3eff1a7 100644
--- a/internal/pkg/apiutil/attribute_test.go
+++ b/internal/pkg/apiutil/attribute_test.go
@@ -16,6 +16,7 @@
 package apiutil
 
 import (
+	"bytes"
 	"net"
 	"testing"
 
@@ -1579,3 +1580,105 @@ func Test_UnknownAttribute(t *testing.T) {
 	assert.Equal(input.Type, output.Type)
 	assert.Equal(input.Value, output.Value)
 }
+
+func TestFullCyclePrefixSID(t *testing.T) {
+	tests := []struct {
+		name  string
+		input []byte
+	}{
+		{
+			name:  "srv6 prefix sid",
+			input: []byte{0xc0, 0x28, 0x25, 0x05, 0x00, 0x22, 0x00, 0x01, 0x00, 0x1e, 0x00, 0x20, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x13, 0x00, 0x01, 0x00, 0x06, 0x28, 0x18, 0x10, 0x00, 0x10, 0x40},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			attribute := bgp.PathAttributePrefixSID{}
+			if err := attribute.DecodeFromBytes(tt.input); err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			// Converting from Native to API
+			apiPrefixSID := NewPrefixSIDAttributeFromNative(&attribute)
+			// Converting back from API to Native
+			recoveredPrefixSID, err := bgp.NewPathAttributePrefixSID(apiPrefixSID)
+			if err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			recovered, err := recoveredPrefixSID.Serialize()
+			if err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			if !bytes.Equal(tt.input, recovered) {
+				t.Fatalf("round trip conversion test failed as expected prefix sid attribute %+v does not match actual: %+v", tt.input, recovered)
+			}
+		})
+	}
+}
+
+func TestFullCycleSRv6SIDStructureSubSubTLV(t *testing.T) {
+	tests := []struct {
+		name  string
+		input []byte
+	}{
+		{
+			name:  "srv6 prefix sid",
+			input: []byte{0x01, 0x00, 0x06, 0x28, 0x18, 0x10, 0x00, 0x10, 0x40},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			sstlv := bgp.SRv6SIDStructureSubSubTLV{}
+			if err := sstlv.DecodeFromBytes(tt.input); err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			// Converting from Native to API
+			apiPrefixSID := MarshalSRv6SubSubTLVs([]bgp.PrefixSIDTLVInterface{&sstlv})
+			// Converting back from API to Native
+			_, recoveredPrefixSID, err := bgp.UnmarshalSubSubTLVs(apiPrefixSID)
+			if err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			recovered, err := recoveredPrefixSID[0].Serialize()
+			if err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			if !bytes.Equal(tt.input, recovered) {
+				t.Fatalf("round trip conversion test failed as expected prefix sid attribute %+v does not match actual: %+v", tt.input, recovered)
+			}
+		})
+	}
+}
+
+func TestFullCycleSRv6InformationSubTLV(t *testing.T) {
+	tests := []struct {
+		name  string
+		input []byte
+	}{
+		{
+			name:  "srv6 prefix sid informationw sub tlv",
+			input: []byte{0x01, 0x00, 0x1e, 0x00, 0x20, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x13, 0x00, 0x01, 0x00, 0x06, 0x28, 0x18, 0x10, 0x00, 0x10, 0x40},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			stlv := bgp.SRv6InformationSubTLV{}
+			if err := stlv.DecodeFromBytes(tt.input); err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			// Converting from Native to API
+			apiPrefixSID := MarshalSRv6SubTLVs([]bgp.PrefixSIDTLVInterface{&stlv})
+			// Converting back from API to Native
+			_, recoveredPrefixSID, err := bgp.UnmarshalSubTLVs(apiPrefixSID)
+			if err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			recovered, err := recoveredPrefixSID[0].Serialize()
+			if err != nil {
+				t.Fatalf("test failed with error: %+v", err)
+			}
+			if !bytes.Equal(tt.input, recovered) {
+				t.Fatalf("round trip conversion test failed as expected prefix sid attribute %+v does not match actual: %+v", tt.input, recovered)
+			}
+		})
+	}
+}
diff --git a/pkg/packet/bgp/bgp.go b/pkg/packet/bgp/bgp.go
index 84604312..f72a3706 100644
--- a/pkg/packet/bgp/bgp.go
+++ b/pkg/packet/bgp/bgp.go
@@ -31,7 +31,8 @@ import (
 )
 
 type MarshallingOption struct {
-	AddPath map[RouteFamily]BGPAddPathMode
+	AddPath    map[RouteFamily]BGPAddPathMode
+	Attributes map[BGPAttrType]bool
 }
 
 func IsAddPathEnabled(decode bool, f RouteFamily, options []*MarshallingOption) bool {
@@ -49,6 +50,18 @@ func IsAddPathEnabled(decode bool, f RouteFamily, options []*MarshallingOption)
 	}
 	return false
 }
+func IsAttributePresent(attr BGPAttrType, options []*MarshallingOption) bool {
+	for _, opt := range options {
+		if opt == nil {
+			continue
+		}
+		if o := opt.Attributes; o != nil {
+			_, ok := o[attr]
+			return ok
+		}
+	}
+	return false
+}
 
 const (
 	AFI_IP     = 1
@@ -1588,9 +1601,17 @@ type MPLSLabelStack struct {
 	Labels []uint32
 }
 
-func (l *MPLSLabelStack) DecodeFromBytes(data []byte) error {
+func (l *MPLSLabelStack) DecodeFromBytes(data []byte, options ...*MarshallingOption) error {
 	labels := []uint32{}
 	foundBottom := false
+	bottomExpected := true
+	if IsAttributePresent(BGP_ATTR_TYPE_PREFIX_SID, options) {
+		// If Update carries Prefix SID attribute then there is no a label stack,
+		// but just 3 bytes which are used to carry the lower portion of Prefix SID.
+		// There is no bottom stack indication in this case. Once 3 bytes are stored
+		// breaking out of the loop.
+		bottomExpected = false
+	}
 	for len(data) >= 3 {
 		label := uint32(data[0])<<16 | uint32(data[1])<<8 | uint32(data[2])
 		if label == WITHDRAW_LABEL || label == ZERO_LABEL {
@@ -1599,6 +1620,11 @@ func (l *MPLSLabelStack) DecodeFromBytes(data []byte) error {
 		}
 		data = data[3:]
 		labels = append(labels, label>>4)
+		if !bottomExpected {
+			// Faking found bottom.
+			foundBottom = true
+			break
+		}
 		if label&1 == 1 {
 			foundBottom = true
 			break
@@ -1613,7 +1639,7 @@ func (l *MPLSLabelStack) DecodeFromBytes(data []byte) error {
 	return nil
 }
 
-func (l *MPLSLabelStack) Serialize() ([]byte, error) {
+func (l *MPLSLabelStack) Serialize(options ...*MarshallingOption) ([]byte, error) {
 	buf := make([]byte, len(l.Labels)*3)
 	for i, label := range l.Labels {
 		if label == WITHDRAW_LABEL {
@@ -1624,6 +1650,13 @@ func (l *MPLSLabelStack) Serialize() ([]byte, error) {
 		buf[i*3+1] = byte((label >> 8) & 0xff)
 		buf[i*3+2] = byte(label & 0xff)
 	}
+	if IsAttributePresent(BGP_ATTR_TYPE_PREFIX_SID, options) {
+		// If Update carries Prefix SID attribute then there is no a label stack,
+		// but just 3 bytes which are used to carry the lower portion of Prefix SID.
+		// No need BoS bit set
+		return buf, nil
+	}
+
 	buf[len(buf)-1] |= 1
 	return buf, nil
 }
@@ -1721,7 +1754,7 @@ func (l *LabeledVPNIPAddrPrefix) DecodeFromBytes(data []byte, options ...*Marsha
 	}
 	l.Length = uint8(data[0])
 	data = data[1:]
-	l.Labels.DecodeFromBytes(data)
+	l.Labels.DecodeFromBytes(data, options...)
 	if int(l.Length)-8*(l.Labels.Len()) < 0 {
 		l.Labels.Labels = []uint32{}
 	}
@@ -1746,7 +1779,7 @@ func (l *LabeledVPNIPAddrPrefix) Serialize(options ...*MarshallingOption) ([]byt
 		}
 	}
 	buf = append(buf, l.Length)
-	lbuf, err := l.Labels.Serialize()
+	lbuf, err := l.Labels.Serialize(options...)
 	if err != nil {
 		return nil, err
 	}
@@ -8480,6 +8513,7 @@ var PathAttrFlags map[BGPAttrType]BGPAttrFlag = map[BGPAttrType]BGPAttrFlag{
 	BGP_ATTR_TYPE_AIGP:                     BGP_ATTR_FLAG_OPTIONAL,
 	BGP_ATTR_TYPE_LARGE_COMMUNITY:          BGP_ATTR_FLAG_TRANSITIVE | BGP_ATTR_FLAG_OPTIONAL,
 	BGP_ATTR_TYPE_LS:                       BGP_ATTR_FLAG_OPTIONAL,
+	BGP_ATTR_TYPE_PREFIX_SID:               BGP_ATTR_FLAG_TRANSITIVE | BGP_ATTR_FLAG_OPTIONAL,
 }
 
 // getPathAttrFlags returns BGP Path Attribute flags value from its type and
@@ -9515,6 +9549,7 @@ type PathAttributeMpReachNLRI struct {
 }
 
 func (p *PathAttributeMpReachNLRI) DecodeFromBytes(data []byte, options ...*MarshallingOption) error {
+
 	value, err := p.PathAttribute.DecodeFromBytes(data, options...)
 	if err != nil {
 		return err
@@ -12325,6 +12360,56 @@ func NewPathAttributeUnknown(flags BGPAttrFlag, typ BGPAttrType, value []byte) *
 	}
 }
 
+// BGPUpdateAttributes defines a map with a key as bgp attribute type
+// and value as bool. Value set to true indicates that the attribute specified by the key
+// exists in the bgp update.
+type BGPUpdateAttributes struct {
+	Attribute map[BGPAttrType]bool
+}
+
+func GetBGPUpdateAttributes(data []byte) map[BGPAttrType]bool {
+	m := make(map[BGPAttrType]bool)
+	for p := 0; p < len(data); {
+		flag := data[p]
+		p++
+		if p < len(data) {
+			t := data[p]
+			m[BGPAttrType(t)] = true
+		} else {
+			break
+		}
+		p++
+		var l uint16
+		// Checking for Extened
+		if flag&0x10 == 0x10 {
+			if p+2 <= len(data) {
+				l = binary.BigEndian.Uint16(data[p : p+2])
+			} else {
+				break
+			}
+			p += 2
+		} else {
+			if p < len(data) {
+				l = uint16(data[p])
+				p++
+			} else {
+				break
+			}
+		}
+		p += int(l)
+	}
+	return m
+}
+
+func GetBGPUpdateAttributesFromMsg(msg *BGPUpdate) map[BGPAttrType]bool {
+	m := make(map[BGPAttrType]bool)
+	for _, p := range msg.PathAttributes {
+		m[p.GetType()] = true
+	}
+
+	return m
+}
+
 func GetPathAttribute(data []byte) (PathAttributeInterface, error) {
 	if len(data) < 2 {
 		eCode := uint8(BGP_ERROR_UPDATE_MESSAGE_ERROR)
@@ -12440,6 +12525,11 @@ func (msg *BGPUpdate) DecodeFromBytes(data []byte, options ...*MarshallingOption
 	if len(data) < int(msg.TotalPathAttributeLen) {
 		return NewMessageError(eCode, eSubCode, nil, "path total attribute length exceeds message length")
 	}
+	attributes := GetBGPUpdateAttributes(data)
+	o := MarshallingOption{
+		Attributes: attributes,
+	}
+	options = append(options, &o)
 
 	msg.PathAttributes = []PathAttributeInterface{}
 	for pathlen := msg.TotalPathAttributeLen; pathlen > 0; {
@@ -12457,7 +12547,6 @@ func (msg *BGPUpdate) DecodeFromBytes(data []byte, options ...*MarshallingOption
 		if err != nil {
 			return err
 		}
-
 		err = p.DecodeFromBytes(data, options...)
 		if err != nil {
 			e = err.(*MessageError)
@@ -12519,6 +12608,11 @@ func (msg *BGPUpdate) Serialize(options ...*MarshallingOption) ([]byte, error) {
 	msg.WithdrawnRoutesLen = uint16(len(wbuf) - 2)
 	binary.BigEndian.PutUint16(wbuf, msg.WithdrawnRoutesLen)
 
+	attributes := GetBGPUpdateAttributesFromMsg(msg)
+	o := MarshallingOption{
+		Attributes: attributes,
+	}
+	options = append(options, &o)
 	pbuf := make([]byte, 2)
 	for _, p := range msg.PathAttributes {
 		onepbuf, err := p.Serialize(options...)
@@ -12538,6 +12632,7 @@ func (msg *BGPUpdate) Serialize(options ...*MarshallingOption) ([]byte, error) {
 		}
 		buf = append(buf, nbuf...)
 	}
+
 	return buf, nil
 }
 
diff --git a/pkg/packet/bgp/prefix_sid.go b/pkg/packet/bgp/prefix_sid.go
index 7dd90082..a7983bcd 100644
--- a/pkg/packet/bgp/prefix_sid.go
+++ b/pkg/packet/bgp/prefix_sid.go
@@ -5,6 +5,10 @@ import (
 	"encoding/binary"
 	"encoding/json"
 	"fmt"
+	"net"
+
+	"github.com/golang/protobuf/ptypes"
+	api "github.com/osrg/gobgp/api"
 )
 
 const (
@@ -14,9 +18,8 @@ const (
 type TLVType uint8
 
 type TLV struct {
-	Type     TLVType
-	Length   uint16
-	Reserved uint8
+	Type   TLVType
+	Length uint16
 }
 
 func (s *TLV) Len() int {
@@ -391,7 +394,7 @@ func (s *SRv6InformationSubTLV) MarshalJSON() ([]byte, error) {
 
 func (s *SRv6InformationSubTLV) String() string {
 	var buf bytes.Buffer
-	buf.WriteString(fmt.Sprintf("SID: %s ", string(s.SID)))
+	buf.WriteString(fmt.Sprintf("SID: %s ", net.IP(s.SID).To16().String()))
 	buf.WriteString(fmt.Sprintf("Flag: %d ", s.Flags))
 	buf.WriteString(fmt.Sprintf("Endpoint Behavior: %d ", s.EndpointBehavior))
 	for _, tlv := range s.SubSubTLVs {
@@ -540,3 +543,135 @@ func (s *SRv6SIDStructureSubSubTLV) String() string {
 		s.TranspositionOffset,
 	)
 }
+
+func NewPathAttributePrefixSID(psid *api.PrefixSID) (*PathAttributePrefixSID, error) {
+	t := BGP_ATTR_TYPE_PREFIX_SID
+	s := &PathAttributePrefixSID{
+		PathAttribute: PathAttribute{
+			Flags: PathAttrFlags[t],
+			Type:  t,
+		},
+		TLVs: make([]PrefixSIDTLVInterface, 0),
+	}
+	for _, raw := range psid.Tlvs {
+		var tlv ptypes.DynamicAny
+		if err := ptypes.UnmarshalAny(raw, &tlv); err != nil {
+			return nil, err
+		}
+		switch v := tlv.Message.(type) {
+		case *api.SRv6L3ServiceTLV:
+			tlvLength, tlvs, err := UnmarshalSubTLVs(v.SubTlvs)
+			if err != nil {
+				return nil, err
+			}
+			o := &SRv6L3ServiceAttribute{
+				TLV: TLV{
+					Type:   TLVType(5),
+					Length: tlvLength,
+				},
+			}
+			s.PathAttribute.Length += tlvLength
+			// Storing Sub TLVs in a Service TLV
+			o.SubTLVs = append(o.SubTLVs, tlvs...)
+			// Adding Service TLV to Path Attribute TLV slice.
+			s.TLVs = append(s.TLVs, o)
+		default:
+			return nil, fmt.Errorf("unknown or not implemented Prefix SID type: %+v", v)
+		}
+	}
+	// Final Path Attribute Length is 3 bytes of the header and 1 byte Reserved1
+	s.PathAttribute.Length += (3 + 1)
+	return s, nil
+}
+
+func UnmarshalSubTLVs(stlvs map[uint32]*api.SRv6TLV) (uint16, []PrefixSIDTLVInterface, error) {
+	p := make([]PrefixSIDTLVInterface, 0, len(stlvs))
+	l := uint16(0)
+	// v.SubTlvs is a map by sub tlv type and the value is a slice of sub tlvs of the specific type
+	for t, tlv := range stlvs {
+		switch t {
+		case 1:
+			// Sub TLV Type 1 is SRv6 Informational Sub TLV
+			for _, stlvRaw := range tlv.Tlv {
+				// Instantiating Information Sub TLV
+				info := &SRv6InformationSubTLV{
+					SubTLV: SubTLV{
+						Type: SubTLVType(1),
+					},
+					SubSubTLVs: make([]PrefixSIDTLVInterface, 0),
+				}
+				var raw ptypes.DynamicAny
+				if err := ptypes.UnmarshalAny(stlvRaw, &raw); err != nil {
+					return 0, nil, err
+				}
+				infoProto := raw.Message.(*api.SRv6InformationSubTLV)
+				info.SID = make([]byte, len(infoProto.Sid))
+				copy(info.SID, infoProto.Sid)
+				// TODO Once RFC is published add processing of flags
+				info.Flags = 0
+				info.EndpointBehavior = uint16(infoProto.EndpointBehavior)
+				var sstlvslength uint16
+				var sstlvs []PrefixSIDTLVInterface
+				if len(infoProto.SubSubTlvs) != 0 {
+					// Processing Sub Sub TLVs
+					var err error
+					sstlvslength, sstlvs, err = UnmarshalSubSubTLVs(infoProto.SubSubTlvs)
+					if err != nil {
+						return 0, nil, err
+					}
+					info.SubSubTLVs = append(info.SubSubTLVs, sstlvs...)
+				}
+				// SRv6 Information Sub TLV length consists 1 byte Resrved2, 16 bytes SID, 1 byte flags, 2 bytes Endpoint Behavior
+				// 1 byte Reserved3 and length of Sub Sub TLVs
+				info.SubTLV.Length = 1 + 16 + 1 + 2 + 1 + sstlvslength
+				// For total Srv6 Information Sub TLV length, adding 3 bytes of the Sub TLV header
+				l += info.SubTLV.Length + 4
+				p = append(p, info)
+			}
+		default:
+			return 0, nil, fmt.Errorf("unknown or not implemented Prefix SID Sub TLV type: %d", t)
+		}
+	}
+
+	return l, p, nil
+}
+
+func UnmarshalSubSubTLVs(stlvs map[uint32]*api.SRv6TLV) (uint16, []PrefixSIDTLVInterface, error) {
+	p := make([]PrefixSIDTLVInterface, 0)
+	l := uint16(0)
+	// v.SubTlvs is a map by sub tlv type and the value is a slice of sub tlvs of the specific type
+	for t, tlv := range stlvs {
+		switch t {
+		case 1:
+			// Sub Sub TLV Type 1 is SRv6 Structure Sub Sub TLV
+			for _, stlvRaw := range tlv.Tlv {
+				// Instantiating Information Sub TLV
+				structure := &SRv6SIDStructureSubSubTLV{
+					SubSubTLV: SubSubTLV{
+						Type:   SubSubTLVType(1),
+						Length: 6,
+					},
+				}
+				var raw ptypes.DynamicAny
+				if err := ptypes.UnmarshalAny(stlvRaw, &raw); err != nil {
+					return 0, nil, err
+				}
+				structureProto := raw.Message.(*api.SRv6StructureSubSubTLV)
+				structure.LocalBlockLength = uint8(structureProto.LocalBlockLength)
+				structure.LocatorNodeLength = uint8(structureProto.LocalNodeLength)
+				structure.FunctionLength = uint8(structureProto.FunctionLength)
+				structure.ArgumentLength = uint8(structureProto.ArgumentLength)
+				structure.TranspositionLength = uint8(structureProto.TranspositionLength)
+				structure.TranspositionOffset = uint8(structureProto.TranspositionOffset)
+
+				// SRv6 Structure Sub Sub TLV length consists of header 3 bytes, 6 bytes of value
+				l += (3 + 6)
+				p = append(p, structure)
+			}
+		default:
+			return 0, nil, fmt.Errorf("unknown or not implemented Prefix SID Sub TLV type: %d", t)
+		}
+	}
+
+	return l, p, nil
+}
diff --git a/pkg/packet/bgp/prefix_sid_test.go b/pkg/packet/bgp/prefix_sid_test.go
index 2df8a3a3..a286228c 100644
--- a/pkg/packet/bgp/prefix_sid_test.go
+++ b/pkg/packet/bgp/prefix_sid_test.go
@@ -3,6 +3,9 @@ package bgp
 import (
 	"bytes"
 	"testing"
+
+	"github.com/golang/protobuf/ptypes/any"
+	api "github.com/osrg/gobgp/api"
 )
 
 func TestRoundTripSubSubTLV(t *testing.T) {
@@ -88,3 +91,34 @@ func TestRoundTripPrefixSID(t *testing.T) {
 		})
 	}
 }
+
+func TestNewPathAttributePrefixSID(t *testing.T) {
+	tests := []struct {
+		name  string
+		input *api.PrefixSID
+	}{
+		{
+			name: "path attribute srv6 prefix sid",
+			input: &api.PrefixSID{
+				Tlvs: []*any.Any{
+					{
+						TypeUrl: "type.googleapis.com/gobgpapi.SRv6L3ServiceTLV",
+						Value:   []byte{10, 157, 1, 8, 1, 18, 152, 1, 10, 149, 1, 10, 50, 116, 121, 112, 101, 46, 103, 111, 111, 103, 108, 101, 97, 112, 105, 115, 46, 99, 111, 109, 47, 103, 111, 98, 103, 112, 97, 112, 105, 46, 83, 82, 118, 54, 73, 110, 102, 111, 114, 109, 97, 116, 105, 111, 110, 83, 117, 98, 84, 76, 86, 18, 95, 10, 16, 32, 1, 0, 0, 0, 5, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 18, 0, 24, 17, 34, 71, 8, 1, 18, 67, 10, 65, 10, 51, 116, 121, 112, 101, 46, 103, 111, 111, 103, 108, 101, 97, 112, 105, 115, 46, 99, 111, 109, 47, 103, 111, 98, 103, 112, 97, 112, 105, 46, 83, 82, 118, 54, 83, 116, 114, 117, 99, 116, 117, 114, 101, 83, 117, 98, 83, 117, 98, 84, 76, 86, 18, 10, 8, 40, 16, 24, 24, 16, 40, 16, 48, 64},
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			p, err := NewPathAttributePrefixSID(tt.input)
+			if err != nil {
+				t.Fatalf("failed with error: %+v", err)
+			}
+			t.Logf("resulting prefix sid: %s", p.String())
+			b, _ := p.Serialize()
+			t.Logf("serialized prefix sid: %s", string(b))
+
+		})
+	}
+}
diff --git a/pkg/server/fsm.go b/pkg/server/fsm.go
index b5bcd2d8..b274c210 100644
--- a/pkg/server/fsm.go
+++ b/pkg/server/fsm.go
@@ -757,19 +757,17 @@ func capabilitiesFromConfig(pConf *config.Neighbor) []bgp.ParameterCapabilityInt
 		}
 	}
 
-	// unnumbered BGP
-	if pConf.Config.NeighborInterface != "" {
-		tuples := []*bgp.CapExtendedNexthopTuple{}
-		families, _ := config.AfiSafis(pConf.AfiSafis).ToRfList()
-		for _, family := range families {
-			if family == bgp.RF_IPv6_UC {
-				continue
-			}
-			tuple := bgp.NewCapExtendedNexthopTuple(family, bgp.AFI_IP6)
-			tuples = append(tuples, tuple)
+	// Extended Nexthop Capability (Code 5)
+	tuples := []*bgp.CapExtendedNexthopTuple{}
+	families, _ := config.AfiSafis(pConf.AfiSafis).ToRfList()
+	for _, family := range families {
+		if family == bgp.RF_IPv6_UC {
+			continue
 		}
-		caps = append(caps, bgp.NewCapExtendedNexthop(tuples))
+		tuple := bgp.NewCapExtendedNexthopTuple(family, bgp.AFI_IP6)
+		tuples = append(tuples, tuple)
 	}
+	caps = append(caps, bgp.NewCapExtendedNexthop(tuples))
 
 	// ADD-PATH Capability
 	if c := capAddPathFromConfig(pConf); c != nil {