vpnv4 route advertisements

[m-stawiski]

Hi guys,

I stuck with issue where I am receiving vpn route from another AS via Option B connection but it's not advertised to another AS via Option B as well - both connections to different ASs are on same ASR9K

It's looks like 

AS1 <Option B> AS2(ASR) <Option B> AS3

I can see route from AS1 on AS2 but when I am checking if it is send to AS3 it doesn't seems to be 

is there any "future" that prevent this to happen ?

Regards,

Marcin

[Julio E. Moisa]

Hi

Marcin, are you interconnecting 3 ISP?

[m-stawiski]

Hi Julio,

Kind of

one company acquired another and then third one the first one :-)

Regards,

Marcin

[Julio E. Moisa]

Thank you for reply, do you have control over the PEs to share the config probably the packets are not being tagged in somewhere?

[Georg Pauwen]

Hello,

on a side note, and in addition to Julio's comments, do you have Lite or RFC 3107 configured ?

Post the configs of your three routers, so we can lab this and check if you are missing something...

[m-stawiski]

Hi Georg,

It wan't be possible for me to share config I am afraid - I can only add that 

option B between B and C looks like on ASR

address-family vpnv4 unicast
route-policy Pass-all in
route-policy Pass-all out
next-hop-self
soft-reconfiguration inbound always

where looks like

route-policy Pass-all
pass
end-policy

so all vpn prefixes should be send to C and this is a case for prefixes advertised from B to C but not from A to C via B if this make a sense 

Regards,

Marcin 

[Julio E. Moisa]

On the ASR, you could verify:

- Static route with the BGP peering

- if retaing route-target all is configured under the BGP process

[m-stawiski]

Hi Julio,

Yes we have under BGP 

address-family vpnv4 unicast
retain route-target all

and also static entry 

if i do on ASR(AS-B) (where x.x.x.x is subnet received from AS-A)

show bgp vpnv4 unicast rd x.x.x.x:yyy advertised

i can see that subnet is advertised to RR but not to AS-C

whilst other subnet originated in AS-B are advertised to RR and AS-C

so it's only one from A that is not advertised to C

Hope this make sense 

Regards,

Marcin