SD-WAN BGP community filtering

[DaeHeon Kang]

Hi,

I found only 1000:10000 community, which is one of example as below snapshot, can be filtered with BGP routing policy about the routing redistribution between BGP and OMP in service side.

It's likely unable to filter prefixes with any other community number from my test.

Also, I found the community number(65546000) from BGP neighbour in the service side is not changed even if I try to set different numbers when redistributed the route as below capture.

I'd like to confirm if this is normal.

DC-ROUTER#show ip bgp 192.168.40.0
BGP routing table entry for 192.168.40.0/24, version 67
Paths: (2 available, best #2, table default, RIB-failure(17))
Advertised to update-groups:
3
Local, (Received from a RR-client)
12.12.12.12 (metric 2) from 12.12.12.12 (12.12.12.12)
Origin incomplete, metric 1000, localpref 50, valid, internal
Community: 65546000
Extended Community: SoO:0:100 RT:65360:1

[Kanan Huseynli]

Hi,

bgp community propogation is supported in IOS XE only beginning 17.3.1a.

https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/m-unicast-routing.html#concept_jhq_r4p_13b

You should enable this feature under VRF (or VPN) BGP configuration (in BGP template).  Have you enabled it? Do you run IOS XE (cEDGE) with 17.3.1a and later?

I wanted to do it in lab, but router is 17.2.x ,I could not test (command is not accepted). I'll test tomorrow with new image.

HTH,