Configuring Bfd For Bgp - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
l Urgent iteration result change: The iterated next hop is changed, and BGP route reachability
l Non-urgent iteration result change: The iterated next hop is changed, and BGP route
Run either of the following commands to set a delay time after which a device responds to a
BGP next hop change:
l To enable a device to delay responses to all next hop changes, run:
l To enable a device to delay responses to non-urgent next hop changes, run:
If delay-time is not specified, the default delay time of 5s takes effect.
The preceding commands can be run separately or simultaneously The nexthop recursive-
lookup non-critical-event delay command takes precedence over the nexthop recursive-
lookup delay command if both commands are run.
The delay time specified in the nexthop recursive-lookup non-critical-event delay command
must be greater than or equal to that specified in the nexthop recursive-lookup delay command
if both commands are run.
----End
Checking the Configurations
After configuring the BGP next hop delayed response, you can run the following command to
check the previous configuration.
l
l
# Display the delay in responding to a next hop change.
<HUAWEI> display current-configuration configuration bgp | include nexthop
recursive-lookup delay
nexthop recursive-lookup delay 20
# Display the delay in responding to non-urgent next hop changes.
<HUAWEI> display current-configuration configuration bgp | include nexthop
recursive-lookup non-critical-event delay
nexthop recursive-lookup non-critical-event delay 25

8.20 Configuring BFD for BGP

BFD for BGP speeds up fault detection and therefore increases the route convergence speed.
Issue 02 (2014-09-30)
is also changed. For example, if a fault occurs on a network, a device finds no next-hop route
or tunnel to which a BGP route is iterated. As a result, traffic is interrupted.
reachability is not affected. For example, after the interface or type of a tunnel to which the
next hop of a BGP route is iterated is changed, traffic keeps traveling over the BGP route.
nexthop recursive-lookup delay [ delay-time ]
nexthop recursive-lookup non-critical-event delay [ delay-time ]
Run the display current-configuration configuration bgp | include nexthop recursive-
lookup delay command to view information about the delay in responding to a next hop
change.
Run the display current-configuration configuration bgp | include nexthop recursive-
lookup non-critical-event delay command to view information about the delay in
responding to non-urgent next hop changes.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
8 BGP Configuration
854