Hello,
I have several (about 40) BGP peers to which I applied a simple filter-list just like this:
neighbor 10.20.30.40 filter-list 10 out
ip as-path access-list 10 permit ^$
ip as-path access-list 10 permit 12345
so that to 10.20.30.40 only prefixes from our own AS and from AS12345 are advertised.
Now I created a second access-list 11 that only contains our own AS without AS12345.
When I bind this new access-list to any peer, the routes advertised to this peer disappear for
about 20 seconds and the BGP session seems interrupted. Afterwards it reestablishes and
all works exactly like planned - only prefixes originated in our AS are advertised to this peer.
Is there a way to change the advertising prefixes with the filter-list in a "soft" way without
any downtime to the specific peer?
Best regards,
Marc.