BGP VPNV4 Routes in XR

[Anuj Singhi]

Hi,

Is there any way to filter out routes based on route-target in XR platform? If i want to find out routes specific to RT 1:1 in a vrf or in complete bgp vpnv4 table, how can I do that through show commands?

If there is no specific command for RT, can regexp can be used for filtering?

Regards,

Anuj

[smilstea]

The VPNv4 table is divided by RD, not RT. You can filter either on RD or VRF.

Edit: Forgot to mention the CLI.

show bgp vpnv4 unicast rd <rd>

show bgp vpnv4 unicast vrf <vrf>

Sam

[Anuj Singhi]

Yeah through rd and vrf I can filter but then I will get the complete routing table pertaining to that vrf or rd including all the RT's. Is there any way by which I can find out which routes are getting imported through which RT through single or group of commands?

@xthuijs

[xthuijs]

you can check the bgp prefix to see what the RD and RT's are, example below.

also you can filter the routes import at the vrf address family level with a route-policy import rule.

xander

RP/0/RSP0/CPU0:A9K-BNG#show bgp vrf RED 22.1.1.1/32

Mon Jul 16 12:39:17.766 EDT

BGP routing table entry for 22.1.1.1/32, Route Distinguisher: 10.86.188.99:0

Versions:

  Process           bRIB/RIB  SendTblVer

  Speaker                 18          18

Last Modified: May 14 07:22:21.564 for 9w0d

Paths: (1 available, best #1)

  Not advertised to any peer

  Path #1: Received by speaker 0

  Not advertised to any peer

  Local

    131.1.1.2 from 131.1.1.2 (2.2.2.2)

      Received Label 24002

      Origin incomplete, metric 0, localpref 100, valid, internal, best, group-best, import-candidate, imported

      Received Path ID 0, Local Path ID 0, version 18

      Extended community: RT:10:10 RT:100:100

      Source AFI: VPNv4 Unicast, Source VRF: default, Source Route Distinguisher: 2.2.2.2:0

[Anuj Singhi]

so that means there is no way I can find out routes related to one RT, for example

show bgp vpnv4 unicast vrf RED <RT>

something like that.

I have seen the option to use regular expression in order to see the routes coming from any particular AS but there is nothing for RT's.

[xthuijs · Accepted solution]

that is possibly too!
say you have a route-policy defined like this:

route-policy RTshow
if extcommunity rt (x:y) then
pass
endif

you can do show bgp vrf RED route-policy RTshow
xander

[Anuj Singhi]

Thanks Xander,

As always you are of great help..!!