Comprehensive and Detailed Explanation From Cisco SP Core Optimization Knowledge
Cisco IOS supportsBGP Multipathfor installing multiple equal-cost BGP routes (both iBGP and eBGP) into the routing table. The correct global BGP command syntax to set the number of allowable parallel BGP paths is:
maximum-paths
For BGP specifically, the form is:
maximum-paths bgp
This enables the router to install up to the specified number of equal-cost BGP routes (iBGP and eBGP) into the RIB and then potentially into the FIB.
Setting:
maximum-paths bgp 6
allowssixparallel ECMP paths learned via BGP—this matches the requirement in the question.
Why the other options are incorrect
B. multipath eibgp 6Not a valid Cisco IOS command.
C. maximum paths bgp routers 6Invalid syntax.
D. maximum-paths eibgp 6The correct keyword isbgp, noteibgp.Cisco does not use “eibgp” in this context; IOS supports BGP multipath across iBGP/eBGP automatically when configured under maximum-paths bgp.
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