[c-nsp] Possible split horizon issue with bgp signalled vpls

[Nick Ryce]

Just a note to say that after the upgrade we are back in business :)


Nick

On 20 Nov 2013, at 04:44, Pete Lumbis <alumbis at gmail.com<mailto:alumbis at gmail.com>> wrote:

Any idea why Switch 3 has remote label "28" instead of 48?

Do you know if the issue is unidirectional or bidirectional? That is, can Sw2 send to Sw3 but Sw3 can't send back?


On Mon, Nov 18, 2013 at 3:05 PM, Nick Ryce <nick at fluency.net.uk<mailto:nick at fluency.net.uk>> wrote:
Hi,

I’m tearing my hair out with this one and can’t figure out how to resolve it.

I have 3 switches that have a BGP signalled VPLS with customer routers hanging off the end of all 3 ( one switch has 2 cpe )

All have the RD 56595:4 and RT 56595:4

All pseudo wires are up between the switches with config snippets below:-

Switch 1

VFI name: FLVPLS004, state: up, type: multipoint, signaling: BGP
  VPN ID: 4, VE-ID: 3, VE-SIZE: 10
  RD: 56595:4, RT: 56595:4, 56595:4
  Bridge-Domain 903 attachment circuits:
    Vlan903
  Neighbors connected via pseudowires:
  Interface          Peer Address    VE-ID  Local Label  Remote Label    S
  pseudowire100033   46.226.0.9      2      402          39              Y
  pseudowire100037   46.226.0.14     1      401          49              Y

This switch has 1 cpe with any vlan tags stripped and can ping all devices on the other switches


Switch 2

VFI name: FLVPLS004, state: up, type: multipoint, signaling: BGP
  VPN ID: 4, VE-ID: 1, VE-SIZE: 10
  RD: 56595:4, RT: 56595:4, 56595:4
  Bridge-Domain 11 attachment circuits:
    Vlan11
  Neighbors connected via pseudowires:
  Interface          Peer Address    VE-ID  Local Label  Remote Label    S
  pseudowire100015   46.226.0.12     3      49           401             Y
  pseudowire100018   46.226.0.9      2      48           37              Y

This switch has 2 cpe’s with any vlan tags stripped.  They can ping each other and the device connected to switch 1 but cannot ping device on switch 3

Switch 3

VFI name: FLVPLS004, state: up, type: multipoint, signaling: BGP
  VPN ID: 4, VE-ID: 2, VE-SIZE: 10
  RD: 56595:4, RT: 56595:4, 56595:4
  Bridge-Domain 4 attachment circuits:
    Vlan4
  Neighbors connected via pseudowires:
  Interface          Peer Address    VE-ID  Local Label  Remote Label    S
  pseudowire100028   46.226.0.12     3      39           402             Y
  pseudowire100027   46.226.0.14     1      37           28              Y

This switch has 1 cpe device connected with any vlan tags stripped and can only ping the device on switch 1


Each switch can see all the correct mac addresses.

It sounds like split horizon but I assumed this was only to do with the local switch?

All devices are running 15.3(3)S

Any help much appreciated.

Nick




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