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When troubleshooting BGP neighbor relationship issues, it is possible to see the following error message after running the following debugs:
Enable BGP debugs:
diagnose ip router bgp all enable
diagnose ip router bgp level info
diagnose debug enable
BGP: %BGP-3-NOTIFICATION: received from 10.10.10.10 6/1 (Cease/Maximum Number of Prefixes Reached.) 0 data-bytes []
This error message is a result of the local peer advertising more routes than the configured limit on the remote peer.
To verify what routes are being advertised to a neighbor:
get router info bgp neighbors <neighbor IP> advertised-routes
To address this issue, it is possible either to:
- Increase the limit of how many advertised routes can be accepted on the peer's end (more than likely not feasible as in some networks with BGP there can be a large number of routes which may cause performance issues).
- From the local peer, configure route maps or prefix lists to filter what routes are being advertised under the neighbor configuration:
config router prefix-list | config router route-map
For further information on creating prefix lists/route maps:
-
Apply route map or prefix list to the particular neighbor:
config router bgp
config neighbor
edit <neighbor IP>
set route-map-out <route_map_name>
set route-map-in<route_map_name>
set prefix-list-in <prefix_list_name>
set prefix-list-out <prefix_list_name>
end
end
Related article:
Troubleshooting tips for FortiOS routing (RIP, OSPF, BGP, static routes, ECMP)
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