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BGP router does not advertise the routes learned from one iBGP neighbor to another

Core Issue

Due to the Border Gateway Protocol (BGP) not propagating any internal BGP (iBGP) learned routes to another iBGP peer, a full iBGP mesh should be maintained within the Autonomous System (AS).

Resolution

To resolve this issue configure the BGP router to be a route reflector.

By configuring a BGP router to be a route reflector, a full mesh is no longer required. To configure a BGP router to be a route reflector, issue the neighbor route-reflector-client command.

For more information, refer to the Route Reflectors section of BGP Case Studies.

BGP Peering

iBGP using route reflectors

Type of Route Missing from Routing Table

All routes / All routes from specific neighbor

Valid Route to BGP Next Hop

Valid route to next hop exists

show ip bgp neighbors {neighbor  address}

State is established

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