Disabling Fast Reset Of Ebgp Connections - Huawei S6700 Series Configuration Manual

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
Context
BGP peers use update messages to exchange routing information. Update messages can be used
to advertise multiple reachable routes with the same attributes or withdraw multiple unreachable
routes.
BGP does not periodically update a routing table. When BGP routes change, BGP updates the
changed BGP routes in the BGP routing table by sending Update messages. If a route changes
frequently, to prevent the switch from sending Update messages upon every change, set the
interval at which Update messages are sent.
Perform the following steps on a BGP switch:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
bgp as-number
The BGP view is displayed.
Step 3 Run:
peer { ipv4-address | group-name } route-update-interval interval
A MinRouteAdvertisementIntervalTimer is configured.
By default, the interval at which Update messages are sent to IBGP peers is 15s, and the interval
at which Update messages are sent to EBGP peers is 30s.
ipv4-address specifies the address of a specific group. group-name specifies the name of a peer
group. The MinRouteAdvertisementIntervalTimer configured for a peer takes precedence over
the MinRouteAdvertisementIntervalTimer configured for a peer group.
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7.12.5 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
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.
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
Issue 01 (2012-03-15)
NOTE
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.
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