Disabling Fast Reset of EBGP Connections
Disabling rapid EBGP connection reset can prevent repeated reestablishment and deletion of EBGP sessions in the event of route flapping. This speeds up BGP network convergence. Context
Context
Rapid EBGP connection reset is enabled by default. This allows BGP to immediately respond to a fault on an interface and delete the direct EBGP sessions on the interface without waiting for the hold timer to expire and implements rapid BGP network convergence.
Rapid EBGP connection reset enables BGP to quickly respond to interface faults but does not enable BGP to quickly respond to interface recovery. After the interface recovers, BGP uses its state machine to restore relevant sessions.
If the status of an interface used to establish an EBGP connection changes frequently, the EBGP session will be deleted and reestablished repeatedly, causing network flapping. Rapid EBGP connection reset can be disabled in such a situation. BGP will delete direct EBGP sessions on the interface until the hold timer expires. This suppresses BGP network flapping, helps to implement rapid BGP network convergence, and reduces network bandwidth consumption.
Procedure
- Access the system view.
- Access the BGP view.
bgp { as-number-plain | as-number-dot }
- Disable rapid EBGP connection reset.
Rapid EBGP connection reset is disabled in a situation where the status of an interface used to establish an EBGP connection changes frequently. If the status of the interface becomes stable, run the ebgp-interface-sensitive command to enable rapid EBGP connection reset to implement rapid BGP network convergence.