At AS1 Accept all the routes present in AS2 except
default route (default is generated by AS2)
and any routes passed through or generated at AS3.
Here is how I am trying to acheive this.
At AS1 I am using a route-map IN for peering with AS2 as follows
route-map test deny 10
match access-list 1
route-map test permit 20
match as-path 2
access-list 1 permit 0.0.0.0 0.0.0.0
ip as-path access-list 2 deny _3_
ip as-path access-list 2 permit .*
Seq 10 (deny)of route map calls access list 1 which permit 0/0, so 0/0 is be matched and will be denied in the route map, all other routes will be passed to next sequential route map statement. Permit 20 calls ip as path list 2. first statement of ip as path list 2 denies any routes that haved passed through or are originated in AS3 . Second statement permits all other routes so all routes expect AS3 ones will be matched here for permit 20 in route map.
Then there is an implicit deny at the end of route map which will cause AS3 routes to be dropped.
1. Is my understanding of route-map functionality is correct ?
2. Do I also need to define an IP access-list 2 as ip as-path statement has access-list 2 referenced in it ? OR is " Number 2" is an as path list number ?
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