Which method is used to provide a loop-free routing BGP table for IBGP routers in a single AS?
- AS_Path attribute
- full mesh connection requirement
- identical weight attribute on all IBGP routers
- static route establishment between each connected pair of IBGP routers
Explanation: IBGP peers do not prepend their ASN to AS_Path because the NLRI would fail the validity check and would not install the prefix into the IP routing table. No other method exists for detecting loops with IBGP sessions and RFC 4271 prohibits the advertisement of an NLRI received from an IBGP peer to another IBGP peer. RFC 4271 states that all BGP routers in a single AS must be fully meshed to provide a complete loop-free routing table and prevent traffic from being dropped.
Exam with this question: Chapter 11: Quiz - BGP CCNPv8 ENARSI
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