What I did:
Enable Sending BGP Community over internal neighbors over iBGP Session
Microsoft ADO: 25268695
Why I did:
Without this change BGP community send by e-BGP Peers are not carry-forward to other e-BGP peers.
str2-xxxx-lc1-2# show bgp ipv6 20c0:a801::/64
BGP routing table entry for 20c0:a801::/64, version 52141
Paths: (1 available, best #1, table default)
Not advertised to any peer
65000 65500
2603:10e2:400::6 from 2603:10e2:400::6 (3.3.3.6)
Origin IGP, localpref 100, valid, internal, best (First path received)
Last update: Tue Sep 26 16:08:26 2023
str2-xxxx-lc1-2# show ip bgp 192.168.35.128/25
BGP routing table entry for 192.168.35.128/25, version 52688
Paths: (1 available, best #1, table default)
Not advertised to any peer
65000 65502
3.3.3.6 from 3.3.3.6 (3.3.3.6)
Origin IGP, localpref 100, valid, internal, best (First path received)
Last update: Tue Sep 26 15:45:51 2023
After the change
str2-xxxx-lc2-2(config)# router bgp 65100
str2-xxxx-lc2-2(config-router)# address-family ipv4
str2-xxxx-lc2-2(config-router-af)# neighbor INTERNAL_PEER_V4 send-community
str2-xxxx-lc2-2(config-router-af)# exit
str2-xxxx-lc2-2(config-router)# address-family ipv6
str2-xxxx-lc2-2(config-router-af)# neighbor INTERNAL_PEER_V6 send-community
str2-xxxx-lc1-2# show bgp ipv6 20c0:a801::/64
BGP routing table entry for 20c0:a801::/64, version 52400
Paths: (1 available, best #1, table default)
Not advertised to any peer
65000 65500
2603:10e2:400::6 from 2603:10e2:400::6 (3.3.3.6)
Origin IGP, localpref 100, valid, internal, best (First path received)
**Community: 1111:1111**
Last update: Tue Sep 26 16:10:19 2023
str2-xxxx-lc1-2# show ip bgp 192.168.35.128/25
BGP routing table entry for 192.168.35.128/25, version 52947
Paths: (1 available, best #1, table default)
Not advertised to any peer
65000 65502
3.3.3.6 from 3.3.3.6 (3.3.3.6)
Origin IGP, localpref 100, valid, internal, best (First path received)
**Community: 1111:1111**
Last update: Tue Sep 26 16:10:09 2023
Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>
8b7b2a7f7c