QuestionQ184

Routing Policy and Manipulation

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Refer to the exhibit. BGP is operating on the network, and CE1 currently selects routes to the internet through PE1. A network engineer must make the BGP routes CE1 receives from PE2 more preferable. The engineer configured a route map using MED and applied it outbound on CE1 toward PE2. However, after a BGP soft reset, PE1 remains preferred. What action must the engineer take for PE2 to be selected as the next hop?

  • A Configure the route map with MED and local preference to manipulate the route outbound.
  • B Configure the route map with AS path prepend to manipulate the AS path to exit the autonomous system.
  • C Update the route map to use only weight to manipulate the path.
  • D Apply the route map on CE1 in the inbound direction.
Explanation

A BGP route map in the outbound direction changes only the updates CE1 advertises to PE2; it does not modify the routes that CE1 learns from PE2 or their local best-path evaluation. Applying the route map inbound on CE1 for the PE2 neighbor alters the received routes before CE1 selects its best path. Cisco documents neighbor ... route-map ... in as applying a route map to incoming routes and out as applying it to outgoing routes.

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