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# Using BGP-LS in GoBGP library mode
This page explains how to use GoBGP for getting BGP-LS prefixes.
## Contents
- [Basic BGP-LS Example](#basic-bgp-ls-example)
## Basic BGP-LS Example
```go
package main
import (
"context"
"os"
"github.com/golang/protobuf/jsonpb"
api "github.com/osrg/gobgp/api"
gobgp "github.com/osrg/gobgp/pkg/server"
log "github.com/sirupsen/logrus"
)
func main() {
log.SetLevel(log.DebugLevel)
s := gobgp.NewBgpServer()
go s.Serve()
if err := s.StartBgp(context.Background(), &api.StartBgpRequest{
Global: &api.Global{
As: 64512,
RouterId: "10.0.255.254",
ListenPort: -1, // gobgp won't listen on tcp:179
},
}); err != nil {
log.Fatal(err)
}
if err := s.MonitorPeer(context.Background(), &api.MonitorPeerRequest{}, func(p *api.Peer) { log.Info(p) }); err != nil {
log.Fatal(err)
}
// neighbor configuration
n := &api.Peer{
Conf: &api.PeerConf{
NeighborAddress: "172.17.0.2",
PeerAs: 65002,
},
ApplyPolicy: &api.ApplyPolicy{
ImportPolicy: &api.PolicyAssignment{
DefaultAction: api.RouteAction_ACCEPT,
},
ExportPolicy: &api.PolicyAssignment{
DefaultAction: api.RouteAction_REJECT,
},
},
AfiSafis: []*api.AfiSafi{
{
Config: &api.AfiSafiConfig{
Family: &api.Family{
Afi: api.Family_AFI_LS,
Safi: api.Family_SAFI_LS,
},
Enabled: true,
},
},
},
}
if err := s.AddPeer(context.Background(), &api.AddPeerRequest{
Peer: n,
}); err != nil {
log.Fatal(err)
}
marshaller := jsonpb.Marshaler{
Indent: " ",
OrigName: true,
}
// Display incoming Prefixes in JSON format.
if err := s.MonitorTable(context.Background(), &api.MonitorTableRequest{
TableType: api.TableType_GLOBAL,
Family: &api.Family{
Afi: api.Family_AFI_LS,
Safi: api.Family_SAFI_LS,
},
}, func(p *api.Path) {
// Your application should do something useful with the BGP-LS path here.
marshaller.Marshal(os.Stdout, p)
}); err != nil {
log.Fatal(err)
}
select {}
}
```
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