The setup:
R6 peer with BB1 remote-as 54
R6 peer with BB3 remote-as 54
Requirement:
. All traffic from local AS to prefix originated from AS 54 should go toward BB1
. All traffic from local AS to prefix originated from the customers of AS 54 should go toward BB3
Solution:
R6:
router bgp 100
neighbor 54.1.7.254 route-map BB1 in
neighbor 204.12.1.254 route-map BB3 in!
ip as-path access-list 1 permit _54$
!
route-map BB1 permit 10 match as-path 1 set local-preference 200
!route-map BB1 permit 20
!
route-map BB3 permit 10 match as-path 1
!route-map BB3 permit 20
set local-preference 200
I am thinking the route-map BB3 permit 20 does not meet the 2nd requirement about the customers of AS 54. Instead it will match all prefixes
other than the ones originated from AS 54, including all prefixes from other AS using AS 54 as the transit. The correct solution should be creating
another as-path access-list:
ip as-path access-list 20 permit ^54_([0-9]+)
route-map BB3 permit 20
match as-path 20
set local-preference 200
Am I right or wrong on this?