I required your comments on a scenario of multihoming to a single provider.RouterA have 2 links with upstream provider and using maximum-path command to install more than 1 path in routing table for a prefix learned from both eBGP sessions.RouterA have iBGP session with RouterB also in its AS, now my question is that when I check BGP table for a prefix ( suppose 220.127.116.11 /16 ) at RouterB then it shows next hop ip address of its peer i.e RouterA although I am not using nexthop-self command on RouterA.Is this behaviour is due to maximum-path command ??
because of iBGP protocol ,the next-hop attribute is the IP address of the iBGP peer. If you setup another iBGP session between routerB and another routerC, the router C will receive announce for this prefix (18.104.22.168/16) with next-hop address of router A. Check this out:
Router B would not advertise 22.214.171.124/16(learned from eBGP peers) to RouterC b/c of split horizon. As far as Mujeeb's issue is concerned i also have noticed that RouterB would show next-hop to Router A for prefix 126.96.36.199/16 if & only if maximum path 2 is defined on Router A without using next-hop-self.
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