Question:
Refer to the exhibit. A network administrator issues the show bgp ipv4 unicast 10.1.1.0 command on router R1 to verify the network 10.1.1.0 in the BGP table. The administrator notices that there are two routes to reach the network and the route through the neighbor 2.2.2.2 is the best route. Which configuration change can the administrator make on R1 to make the route through 3.3.3.3 the best-path?
- Set weight to 10 for the route through 3.3.3.3.
- Set multi-exit discriminator to 50 for the route through 3.3.3.3.
- Change the BGP RID 2.2.2.2 to 4.4.4.4.
- Set local preference to 50 for the route through 3.3.3.3.
Explanation: Cisco routers review BGP attributes in the following ranked order when deciding which path is the best-path:
- Prefer the highest weight .
- Prefer the highest local preference .
- Prefer the route originated by the local router.
- Prefer the path with the shorter Accumulated Interior Gateway Protocol (AIGP) metric attribute.
- Prefer the shortest AS_Path .
- Prefer the lowest origin code.
- Prefer the lowest multi-exit discriminator (MED).
- Prefer an external path over an internal path.
- Prefer the path through the closest IGP neighbor .
- Prefer the oldest route for EBGP paths.
- Prefer the path with the lowest neighbor BGP RID .
- Prefer the path with the lowest neighbor IP address .
The first path attribute to be checked is the weight. A higher value is better. In this case, no weight is listed because both routes are using the default value 0. Setting the weight higher than 0 will make the route the best-path.
Exam with this question: CCNP Enterprise: Advanced Routing (Version 8.0) – BGP Exam
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