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

[Jason Lixfeld]

Issues I was having with BGP signalled VPLS a couple of months ago in 15.3(2)S1 resulted in filing CSCui46390.  I'd otherwise suggest trying 15.3(3)S1a to see fix works, but that version seems to have introduced CSCuh05321, so I think that might end badly for you; it did for me :(

On Nov 18, 2013, at 3:05 PM, Nick Ryce <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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