Why Is Not the BGP Connection Disconnected Immediately After the shutdown Command Is Run on Either Interface Between Two Devices?

Latest reply: Sep 30, 2018 13:46:03 1205 4 9 0
The BGP connection is disconnected immediately after the shutdown command is run on the interface only when the EBGP neighbors have direct links and the ebgp-interface-sensitive command is configured in the BGP view (by default, this command is configured in the BGP view). The BGP connections between other types of BGP peers are reset only after the Hold timer times out.
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Created Sep 7, 2018 09:36:15 Helpful(1) Helpful(1)

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Created Sep 29, 2018 06:05:43 Helpful(1) Helpful(1)

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Created Sep 29, 2018 06:38:04 Helpful(1) Helpful(1)

If the ebgp-interface-sensitive command is not configured, the system does not immediately select the sub-optimal route for packet transmission when an interface goes Down. Instead, the system waits for a period of time (defaulting to 180 seconds) before checking whether another interface can be used to send packets to the same destination address. This will interrupt services for a period of time. If the ebgp-interface-sensitive command is run, BGP can quickly detect EBGP link faults and use another interface to establish a BGP peer relationship with the remote peer.

When the interface used for a BGP connection alternates between Up and Down states, running the undo ebgp-interface-sensitive command can prevent the repeated reestablishment and deletion of the BGP session in the event of route flapping. This reduces the use of network bandwidth.
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Created Sep 30, 2018 13:46:03 Helpful(0) Helpful(0)

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