Hello, I want to understand what is the order of analysis of a router when applying to a BGP peer (inbound or outbound ), a route-map, a filter-list and a prefix-list.
Hello Willy,
According to this document:
BGP uses the following order:
| Inbound | Outbound |
|---|---|
| Route map | Distribute list |
| Filter list, AS-path ACL, or IP policy | IP prefix list |
| IP prefix list | Filter list, AS-path ACL, or IP policy |
| Distribute list | Route map |
Depending on the platform and/or IOS version, this can sometimes be different though. Also, in production networks, there’s not really a need to mix these as it’s usually easier to use the route-map for everything.
Rene
Can I check. This order of operation is only applicable to filtering of IPv6 prefixes. How about for IPv4? Thanks.
Hello Leon
This order of operations is not protocol-specific. In the documentation presented above, it refers to IPv4, however, the same order applies for IPv6 as well.
I hope this has been helpful!
Laz