[chassis/multi-asic] Enable Sending BGP Community over internal neighbors over iBGP Session (sonic-net#16705)

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 <[email protected]>

Author: abdosi

dockers/docker-fpm-frr/frr/bgpd/templates/internal/peer-group.conf.j2

@@ -14,6 +14,7 @@
     neighbor INTERNAL_PEER_V4 allowas-in 1
     neighbor INTERNAL_PEER_V4 route-map FROM_BGP_INTERNAL_PEER_V4 in
     neighbor INTERNAL_PEER_V4 route-map TO_BGP_INTERNAL_PEER_V4 out
+    neighbor INTERNAL_PEER_V4 send-community
   exit-address-family
 {% if CONFIG_DB__DEVICE_METADATA['localhost']['switch_type'] == 'chassis-packet' %}
   neighbor INTERNAL_PEER_V6 update-source Loopback4096
@@ -26,6 +27,7 @@
     neighbor INTERNAL_PEER_V6 allowas-in 1
     neighbor INTERNAL_PEER_V6 route-map FROM_BGP_INTERNAL_PEER_V6 in
     neighbor INTERNAL_PEER_V6 route-map TO_BGP_INTERNAL_PEER_V6 out
+    neighbor INTERNAL_PEER_V6 send-community
   exit-address-family
 !
 ! end of template: bgpd/templates/internal/peer-group.conf.j2

dockers/docker-fpm-frr/frr/bgpd/templates/voq_chassis/peer-group.conf.j2

@@ -12,6 +12,7 @@
     neighbor VOQ_CHASSIS_V4_PEER soft-reconfiguration inbound
     neighbor VOQ_CHASSIS_V4_PEER route-map FROM_VOQ_CHASSIS_V4_PEER in
     neighbor VOQ_CHASSIS_V4_PEER route-map TO_VOQ_CHASSIS_V4_PEER out
+    neighbor VOQ_CHASSIS_V4_PEER send-community
   exit-address-family
   address-family ipv6
 {% if CONFIG_DB__DEVICE_METADATA['localhost']['type'] == 'ToRRouter' %}
@@ -22,6 +23,7 @@
     neighbor VOQ_CHASSIS_V6_PEER soft-reconfiguration inbound
     neighbor VOQ_CHASSIS_V6_PEER route-map FROM_VOQ_CHASSIS_V6_PEER in
     neighbor VOQ_CHASSIS_V6_PEER route-map TO_VOQ_CHASSIS_V6_PEER out
+    neighbor VOQ_CHASSIS_V6_PEER send-community
   exit-address-family
 !
 ! end of template: bgpd/templates/voq_chassis/peer-group.conf.j2

src/sonic-bgpcfgd/tests/data/internal/peer-group.conf/result_back.conf

@@ -9,13 +9,15 @@
     neighbor INTERNAL_PEER_V4 allowas-in 1
     neighbor INTERNAL_PEER_V4 route-map FROM_BGP_INTERNAL_PEER_V4 in
     neighbor INTERNAL_PEER_V4 route-map TO_BGP_INTERNAL_PEER_V4 out
+    neighbor INTERNAL_PEER_V4 send-community
   exit-address-family
   address-family ipv6
     neighbor INTERNAL_PEER_V6 route-reflector-client
     neighbor INTERNAL_PEER_V6 soft-reconfiguration inbound
     neighbor INTERNAL_PEER_V6 allowas-in 1
     neighbor INTERNAL_PEER_V6 route-map FROM_BGP_INTERNAL_PEER_V6 in
     neighbor INTERNAL_PEER_V6 route-map TO_BGP_INTERNAL_PEER_V6 out
+    neighbor INTERNAL_PEER_V6 send-community
   exit-address-family
 !
 ! end of template: bgpd/templates/internal/peer-group.conf.j2

src/sonic-bgpcfgd/tests/data/internal/peer-group.conf/result_chasiss_packet.conf

@@ -9,13 +9,15 @@
     neighbor INTERNAL_PEER_V4 allowas-in 1
     neighbor INTERNAL_PEER_V4 route-map FROM_BGP_INTERNAL_PEER_V4 in
     neighbor INTERNAL_PEER_V4 route-map TO_BGP_INTERNAL_PEER_V4 out
+    neighbor INTERNAL_PEER_V4 send-community
   exit-address-family
   neighbor INTERNAL_PEER_V6 update-source Loopback4096 
   address-family ipv6
     neighbor INTERNAL_PEER_V6 soft-reconfiguration inbound
     neighbor INTERNAL_PEER_V6 allowas-in 1
     neighbor INTERNAL_PEER_V6 route-map FROM_BGP_INTERNAL_PEER_V6 in
     neighbor INTERNAL_PEER_V6 route-map TO_BGP_INTERNAL_PEER_V6 out
+    neighbor INTERNAL_PEER_V6 send-community
   exit-address-family
 !
 ! end of template: bgpd/templates/internal/peer-group.conf.j2

src/sonic-bgpcfgd/tests/data/internal/peer-group.conf/result_front.conf

@@ -8,12 +8,14 @@
     neighbor INTERNAL_PEER_V4 allowas-in 1
     neighbor INTERNAL_PEER_V4 route-map FROM_BGP_INTERNAL_PEER_V4 in
     neighbor INTERNAL_PEER_V4 route-map TO_BGP_INTERNAL_PEER_V4 out
+    neighbor INTERNAL_PEER_V4 send-community
   exit-address-family
   address-family ipv6
     neighbor INTERNAL_PEER_V6 soft-reconfiguration inbound
     neighbor INTERNAL_PEER_V6 allowas-in 1
     neighbor INTERNAL_PEER_V6 route-map FROM_BGP_INTERNAL_PEER_V6 in
     neighbor INTERNAL_PEER_V6 route-map TO_BGP_INTERNAL_PEER_V6 out
+    neighbor INTERNAL_PEER_V6 send-community
   exit-address-family
 !
 ! end of template: bgpd/templates/internal/peer-group.conf.j2

src/sonic-bgpcfgd/tests/data/voq_chassis/peer-group.conf/result_all.conf

@@ -10,6 +10,7 @@
     neighbor VOQ_CHASSIS_V4_PEER soft-reconfiguration inbound
     neighbor VOQ_CHASSIS_V4_PEER route-map FROM_VOQ_CHASSIS_V4_PEER in
     neighbor VOQ_CHASSIS_V4_PEER route-map TO_VOQ_CHASSIS_V4_PEER out
+    neighbor VOQ_CHASSIS_V4_PEER send-community
   exit-address-family
   address-family ipv6
     neighbor VOQ_CHASSIS_V6_PEER allowas-in 1
@@ -18,6 +19,7 @@
     neighbor VOQ_CHASSIS_V6_PEER soft-reconfiguration inbound
     neighbor VOQ_CHASSIS_V6_PEER route-map FROM_VOQ_CHASSIS_V6_PEER in
     neighbor VOQ_CHASSIS_V6_PEER route-map TO_VOQ_CHASSIS_V6_PEER out
+    neighbor VOQ_CHASSIS_V6_PEER send-community
   exit-address-family
 !
 ! end of template: bgpd/templates/voq_chassis/peer-group.conf.j2

src/sonic-bgpcfgd/tests/data/voq_chassis/peer-group.conf/result_base.conf

@@ -9,13 +9,15 @@
     neighbor VOQ_CHASSIS_V4_PEER soft-reconfiguration inbound
     neighbor VOQ_CHASSIS_V4_PEER route-map FROM_VOQ_CHASSIS_V4_PEER in
     neighbor VOQ_CHASSIS_V4_PEER route-map TO_VOQ_CHASSIS_V4_PEER out
+    neighbor VOQ_CHASSIS_V4_PEER send-community
   exit-address-family
   address-family ipv6
     neighbor VOQ_CHASSIS_V6_PEER activate
     neighbor VOQ_CHASSIS_V6_PEER addpath-tx-all-paths
     neighbor VOQ_CHASSIS_V6_PEER soft-reconfiguration inbound
     neighbor VOQ_CHASSIS_V6_PEER route-map FROM_VOQ_CHASSIS_V6_PEER in
     neighbor VOQ_CHASSIS_V6_PEER route-map TO_VOQ_CHASSIS_V6_PEER out
+    neighbor VOQ_CHASSIS_V6_PEER send-community
   exit-address-family
 !
 ! end of template: bgpd/templates/voq_chassis/peer-group.conf.j2