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BGP communities not advertised to the BGP peer

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TitleBGP communities not advertised to the BGP peer
Symptoms
BGP communities are not advertised to the BGP peer.

Sample output: 

 
SSH@la2-mlx2#show ip bgp neighbors 10.23.16.174 advertised-routes detail 
There are 2 routes advertised to neighbor 10.23.16.174 
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST E:EBGP I:IBGP L:LOCAL 
1 Prefix: 32.253.16.8/29, Status: BE, Age: 39d19h30m42s 
NEXT_HOP: 10.23.16.173, Learned from Peer: 10.23.10.233 (3549) 
LOCAL_PREF: none, MED: none, ORIGIN: igp, Weight: 0 
AS_PATH: 6220 3549 64608 
Adj_RIB_out count: 6, Admin distance 20 
2 Prefix: 32.252.48.184/29, Status: BE, Age: 23h29m34s 
NEXT_HOP: 10.23.16.173, Learned from Peer: 10.23.10.233 (3549) 
LOCAL_PREF: none, MED: none, ORIGIN: igp, Weight: 0 
AS_PATH: 6220 3549 64609 
Adj_RIB_out count: 6, Admin distance 20 

 
 
Environment
  • MLX 
  • NI6.0.00j 
Cause
“send-community both” is not configured on both the peer.
Resolution
“send-community both” needs to be configured on both the peer to see the communities being advertised and received. 
 
Additional notes
Below is the example configuration to follow: 
 
MLX1#sh running-config | inc 10.23.16.174 
neighbor 10.23.16.174 remote-as 13979 
neighbor 10.23.16.174 description DOR_4598759 
neighbor 10.23.16.174 soft-reconfiguration inbound 
neighbor 10.23.16.174 route-map out ATT-voip 
neighbor 10.23.16.174 send-community both ------ You need to configure send-community on both peers
 
Output showing community being advertised 
 
MLX1#show ip bgp neighbors 10.23.16.174 advertised-routes detail  
There are 1 routes advertised to neighbor 10.23.16.174  
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST E:EBGP I:IBGP L:LOCAL x:BEST-EXTERNAL  
Prefix: 32.252.48.184/29, Rx path-id:0x00000000, Tx path-id:0x08000001, rank:0x00000001, Status: BL,  Age: 4d19h14m7s  
NEXT_HOP: 10.23.16.173, Learned from Peer: Local Router  
LOCAL_PREF: none,  MED: 1,  ORIGIN: igp,  Weight: 32768,  GROUP_BEST: 1  
AS_PATH: 6220  
COMMUNITIES: 13979:110  
Adj_RIB_out count: 1,  Admin distance 1  

 

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