In which of the following BGP-related events is an End-of-RIB (EOR) message sent?

Question

Options

• AFollowing a link flap in the BGP speaker's AS
• BDuring initial convergence.
• CFollowing a Route Processor Switchover.
• DJust before sending a CEASE message to tear down the session.
• EDuring capability negotiation

• A
  17% (4)
• B
  71% (17)
• D
  4% (1)
• E
  8% (2)

Explanation

The Peer Router must signal the completion of the initial routing update by sending the End-of- RIB marker (discussed below) While continuing to forward packets, the Peer Router refreshes the Restarting Router with any relevant BGP updates. The Peer Router indicates completion of this process by sending an End- of-RIB (EOR) marker. The EOR marker for IPv4 is a BGP update message that is of the minimum length--23 bytes. The EOR does not contain any routes to be added or withdrawn. Essentially, it is an "empty" update, whose sole purpose is to indicate that all available routes have been sent. The EOR marker helps speed convergence, because it allows the router to begin best-path selection as quickly as possible, without waiting for the timer to expire. Once the Restarting Router has received all available routes from each peer, it can conduct best- path selection, and send any updates to its Peer Routers. The Restarting Router will also use the EOR to indicate the completion of this process.

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