1 files changed, 56 insertions, 0 deletions
diff --git a/table/destination_test.go b/table/destination_test.go
index c0666e21..275c4473 100644
--- a/table/destination_test.go
+++ b/table/destination_test.go
@@ -217,6 +217,62 @@ func TestImplicitWithdrawCalculate(t *testing.T) {
 	assert.Equal(t, len(d.knownPathList), 1)
 }
 
+func TestMedTieBreaker(t *testing.T) {
+	nlri := bgp.NewIPAddrPrefix(24, "10.10.0.0")
+
+	p0 := func() *Path {
+		aspath := bgp.NewPathAttributeAsPath([]bgp.AsPathParamInterface{bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint32{65001, 65002}), bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint32{65003, 65004})})
+		attrs := []bgp.PathAttributeInterface{aspath, bgp.NewPathAttributeMultiExitDisc(0)}
+		return NewPath(nil, nlri, false, attrs, time.Now(), false)
+	}()
+
+	p1 := func() *Path {
+		aspath := bgp.NewPathAttributeAsPath([]bgp.AsPathParamInterface{bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint32{65001, 65002}), bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint32{65003, 65004})})
+		attrs := []bgp.PathAttributeInterface{aspath, bgp.NewPathAttributeMultiExitDisc(10)}
+		return NewPath(nil, nlri, false, attrs, time.Now(), false)
+	}()
+
+	// same AS
+	assert.Equal(t, compareByMED(p0, p1), p0)
+
+	p2 := func() *Path {
+		aspath := bgp.NewPathAttributeAsPath([]bgp.AsPathParamInterface{bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint32{65003})})
+		attrs := []bgp.PathAttributeInterface{aspath, bgp.NewPathAttributeMultiExitDisc(10)}
+		return NewPath(nil, nlri, false, attrs, time.Now(), false)
+	}()
+
+	// different AS
+	assert.Equal(t, compareByMED(p0, p2), (*Path)(nil))
+
+	p3 := func() *Path {
+		aspath := bgp.NewPathAttributeAsPath([]bgp.AsPathParamInterface{bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint32{65001, 65002}), bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_CONFED_SEQ, []uint32{65003, 65004})})
+		attrs := []bgp.PathAttributeInterface{aspath, bgp.NewPathAttributeMultiExitDisc(0)}
+		return NewPath(nil, nlri, false, attrs, time.Now(), false)
+	}()
+
+	p4 := func() *Path {
+		aspath := bgp.NewPathAttributeAsPath([]bgp.AsPathParamInterface{bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint32{65001, 65002}), bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_CONFED_SEQ, []uint32{65005, 65006})})
+		attrs := []bgp.PathAttributeInterface{aspath, bgp.NewPathAttributeMultiExitDisc(10)}
+		return NewPath(nil, nlri, false, attrs, time.Now(), false)
+	}()
+
+	// ignore confed
+	assert.Equal(t, compareByMED(p3, p4), p3)
+
+	p5 := func() *Path {
+		attrs := []bgp.PathAttributeInterface{bgp.NewPathAttributeMultiExitDisc(0)}
+		return NewPath(nil, nlri, false, attrs, time.Now(), false)
+	}()
+
+	p6 := func() *Path {
+		attrs := []bgp.PathAttributeInterface{bgp.NewPathAttributeMultiExitDisc(10)}
+		return NewPath(nil, nlri, false, attrs, time.Now(), false)
+	}()
+
+	// no aspath
+	assert.Equal(t, compareByMED(p5, p6), p5)
+}
+
 func TestTimeTieBreaker(t *testing.T) {
 	origin := bgp.NewPathAttributeOrigin(0)
 	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65001})}