BGP aggregate-address suppress-map behaviour

[lunar_rover]

Hi,

I've been working on some tweaks to our BGP setup, and wondered if anyone else could confirm some behaviour I've noticed.

When using the aggregate-address command with a suppress-map, it would seem that if you match prefixes to be suppressed using a prefix-list, the suppress-map doesn't work, but if you use an access-list to match the prefixes with the same route-map, it does!

Also, when a suppress-map is in operation - would one normally expected to see the prefixes being suppressed in the local bgp table marked with an "s", similar to how they are when using the "summary-only" syntax on an aggregate-address, or not?

Thanks in advance for any thoughts/comments.

[lgijssel]

Please post the access-list and the corresponding prefix-list. A listing of the related prefixes and  relevant config may be helpful as well.

This info will enable us to check for possible configuration issues.

regards,

Leo

[lunar_rover]

Hi, thanks for replying, was just about to delete discussion as this was user (me) error.

Both access-list and prefix-list work fine as the matching criteria for the suppress-map.

Also prefixes matched by the suppress-map do get marked with "s" in the bgp table.

Apologies for wasting anyone's time.

[lgijssel]

Yeah, I already expected some kind of user error.

In most cases it is preferred to use prefix-lists over acl's.

Good that you found the problem yourself.

regards,

Leo