A network administrator is configuring a BGP router with the neighbor 10.12.1.2 maximum-prefix 20 75 command. What will happen when the peer at 10.12.1.2 advertises 15 routes?

A network administrator is configuring a BGP router with the neighbor 10.12.1.2 maximum-prefix 20 75 command. What will happen when the peer at 10.12.1.2 advertises 15 routes?

• The router moves the peer to the Idle state and closes the BGP session.
• The router transitions to listening mode and does not install any new routes into the BGP table.
• The router drops any further advertisements from the peer.
• The router sends a warning message to the peer.

Explanation: The prefix restrictions can be put on a BGP neighbor by using the BGP address family configuration command neighbor ip-address maximum-prefix prefix-count [ warning-percentage ] [ restart time ] [ warning-only ]. When a peer advertises more routes than the maximum prefix count, the router moves the neighbor to the Idle (PfxCt) state in the finite-state machine (FSM), closes the BGP session, and sends out the appropriate syslog message. A warning is not generated before the prefix limit is reached. By adding a warning percentage (set to 1 to 100) after the maximum prefix count, a warning message will be sent when the percentage is reached.

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