Question

A network engineer manages an eBGP edge router (AS 65010) that advertises the 203.0.113.0/24 prefix to two directly connected upstream ISPs: ISP-A (AS 64500) via GigabitEthernet0/0 and ISP-B (AS 64501) via GigabitEthernet0/1. The company wants ISP-A to be the primary path for all INBOUND traffic to 203.0.113.0/24, using ISP-B only if the ISP-A link fails. The engineer cannot influence the ISPs' local policies. Which action taken on the edge router will best achieve this goal?

Accepted Answer

Apply an outbound route-map to the ISP-B neighbor that prepends the local AS multiple times to the AS-path of 203.0.113.0/24

Answer

Apply an outbound route-map to the ISP-A neighbor that sets a higher local-preference for 203.0.113.0/24

Answer

Apply an inbound route-map to the ISP-A neighbor that sets a higher weight for received routes

Answer

Apply an outbound route-map to the ISP-B neighbor that sets a lower MED for 203.0.113.0/24