Configure iBGP between ESR1 and ESR3. Enable extended community sending on both devices.
ESR1(config)# router bgp log-neighbor-changes
ESR1(config)# router bgp 65500
ESR1(config-bgp)# router-id 1.1.1.1
ESR1(config-bgp)# enable
ESR1(config-bgp)# neighbor 3.3.3.3
ESR1(config-bgp-neighbor)# remote-as 65500
ESR1(config-bgp-neighbor)# update-source 1.1.1.1
ESR1(config-bgp-neighbor)# enable
ESR1(config-bgp-neighbor)# address-family ipv4 unicast
ESR1(config-bgp-neighbor-af)# enable
ESR1(config-bgp-neighbor-af)# exit
ESR1(config-bgp-neighbor)# address-family vpnv4 unicast
ESR1(config-bgp-neighbor-af)# send-community extended
ESR1(config-bgp-neighbor-af)# enable
ESR3(config)# router bgp log-neighbor-changes
ESR3(config)# router bgp 65500
ESR3(config-bgp)# router-id 3.3.3.3
ESR3(config-bgp)# enable
ESR3(config-bgp)# neighbor 1.1.1.1
ESR3(config-bgp-neighbor)# remote-as 65500
ESR3(config-bgp-neighbor)# update-source 3.3.3.3
ESR3(config-bgp-neighbor)# enable
ESR3(config-bgp-neighbor)# address-family ipv4 unicast
ESR3(config-bgp-neighbor-af)# enable
ESR3(config-bgp-neighbor-af)# exit
ESR3(config-bgp-neighbor)# address-family vpnv4 unicast
ESR3(config-bgp-neighbor-af)# send-community extended
ESR3(config-bgp-neighbor-af)# enable
It is necessary to make sure that BGP session is successfully established.
ESR1# show ip bgp neighbors
BGP neighbor is 3.3.3.3
BGP state: Established
Neighbor address: 3.3.3.3
Neighbor AS: 65500
Neighbor ID: 3.3.3.3
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: internal multihop AS4
Source address: 1.1.1.1
Weight: 0
Hold timer: 126/180
Keepalive timer: 40/60
Address family ipv4 unicast:
Default originate: No
Default information originate: No
Uptime: 88495 s
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