Waiting for BGP Convergence

When BGP converges, the transit router again has the reachability information it needs to forward traffic to destinations that are not directly connected. Typically, you then want the transit router to clear the overload bit in its LSP and retransmit the LSP to inform the other routers in the domain that they can use it as a transit router.

BGP is assumed to have converged when all of the following conditions have been met:

• 90 percent of BGP peers have reached an established state,
• The transit router has received an end-of-rib marker from all IBGP peers that advertise the graceful-restart capability.
• The average rate of learning new routes has dropped to a low level.

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