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Cisco 300-540 Exam - Topic 1 Question 11 Discussion
Topic #: 1
Refer to the exhibit.
Refer to the exhibit. An engineer working for a private service provider with an employee ID 5207:22:409 must configure iBGP multipath load sharing across the three paths. Which two commands must be run on the PE router? (Choose two.)
A. maximum-paths ibgp 3 B. ip load-sharing per-destination C. ip load-sharing ibgp 3 D. router bgp 101 E. router bgp 100
In the diagram, the PE and R2, R3, R4, R5 belong to AS 100. The PE router runs BGP process AS 100, so its BGP configuration must start with:
router bgp 100
To perform iBGP multipath load sharing across three equal-cost internal BGP paths, BGP must be instructed to keep and use multiple iBGP paths in the routing table. This is done with:
router bgp 100
maximum-paths ibgp 3
maximum-paths ibgp 3 tells BGP to install up to three iBGP paths to the same prefix, enabling CEF to load-share across those paths.
router bgp 100 is required because the PE is in AS 100, not 101.
Other options:
ip load-sharing per-destination affects CEF behavior but does not enable BGP iBGP multipath by itself and is not specific to three iBGP paths.
ip load-sharing ibgp 3 is not a valid IOS BGP command.
router bgp 101 would configure the wrong AS and break the iBGP relationships shown in AS-100.
Thus, the correct commands on the PE to achieve iBGP multipath load sharing over the three internal paths are maximum-paths ibgp 3 and router bgp 100, corresponding to A and E.
Raymon
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