Cisco Designing and Implementing Cisco Service Provider Cloud Network Infrastructure (SPCNI v1.0) 300-540 Question # 1 Topic 1 Discussion
300-540 Exam Topic 1 Question 1 Discussion:
Question #: 1
Topic #: 1
Refer to the exhibit. An engineer must configure iBGP multipath load sharing across three paths. Which two commands must be run on router R2? (Choose two.)
RouterR2is insideAS 100and has three iBGP paths (via R3, R4, R5) toward AS 101. To performiBGP multipathacross these three equal-cost paths, BGP must:
Run the correct BGP process forAS 100
Allow installation of multiple iBGP paths in the routing table
This is done with:
router bgp 100
maximum-paths ibgp 3
router bgp 100– enters the BGP process for AS 100 (correct AS per diagram).
maximum-paths ibgp 3– tells BGP to keep up to 3 iBGP paths to the same destination, enabling CEF to load-share across them.
Other options:
ip load-sharing ibgp 3– not a valid command.
router bgp 101– wrong AS number.
ip load-sharing per-destination– controls CEF hashing but does not enable BGP to install multiple iBGP paths by itself.
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