300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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AS 111 wants to use AS 200 as the preferred path for 172.20.5.0/24, with AS 100 as the backup. After the configuration, AS 100 is not used for any other routes.

Which configuration resolves the issue?

A route-map SETLP permit 10 match ip address prefix-list PLIST1 set local-preference 99 route-map SETLP permit 20
B router bgp 111 no neighbor 192.168.10.1 route-map SETLP in neighbor 192.168.20.2 route-map SETLP in
C route-map SETLP permit 10 match ip address prefix-list PLIST1 set local-preference 110 route-map SETLP permit 20
D router bgp 111 no neighbor 192.168.10.1 route-map SETLP in neighbor 192.168.10.1 route-map SETLP out

Explanation

An inbound route map permits only routes that match one of its permit sequences. With only the prefix-specific sequence, all other routes received from AS 100 fall through the route map and are denied. Adding route-map SETLP permit 20 with no match conditions permits every remaining route unchanged, while the matched 172.20.5.0/24 route retains local preference 90. The AS 200 route retains the higher default local preference of 100 and therefore remains preferred.

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300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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