Route mask with /16 or /24 under bgp route-policy in ASR router

[wfqk]

Hi As we know, bgp route-policy controls if routes can be forwarded. Here are example:

If route 10.1.0.0/16 is permitted to pass in route-policy, the route can be forwarded to pass. If route is10.1.0.0/24 under the same route-policy, can it be forwarded to pass? 

It looks like there is difference with ACL for traffic in interface

Thank you

[Georg Pauwen · Accepted solution]

Hello,

whatever is matched in the route policy needs to be in the routing table. If 10.1.0.0/16 is in the routing table, it will match (and pass). If only 10.1.0.0/16 is in the routing table, and you try to match 10.1.0.0/24, it will be dropped (due to the implicit drop/deny at the end of any route map).

Is this what you are asking ?

[wfqk]

Thank you so much for your reply. Yes you are right. 

It's opposite to ACL in interface, It can permit all traffic under the prefix to pass, right?   

[Georg Pauwen · Accepted solution]

Hello,

exactly. If you allow e.g. 10.0.0.0/8 to pass, everything 'below' would pass as well, such as 10.1.0.0/16, or 10.1.1.0/24. With BGP route maps, you need exact matches.

[wfqk]

Thank you!