Checking The Configuration; Configuring Bgp Route Dampening - Huawei S6700 Series Configuration Manual

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
The BGP view is displayed.
Step 3 Run:
peer { group-name | ipv4-address } tracking [ delay delay-time ]
BGP tracking is enabled on the device to detect the status of a specified peer.
By default, BGP tracking is disabled.
ipv4-address specifies the address of a peer. group-name specifies the name of a peer group.
BGP tracking configured on a peer takes precedence over BGP tracking configured on the peer
group of this peer.
If delay-time is not specified, the default delay (0 seconds) is used. This means that a BGP device
tears down the connection with a peer immediately after detecting the peer unreachable.
A proper delay-time value can ensure network stability.
l If an IBGP peer relationship is established based on an IGP route, the delay-time values set
l If BGP peers have negotiated the GR capability and one of the peers performs an active/
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7.12.7 Checking the Configuration

After the BGP network convergence speed is adjusted, you can view information about BGP
peers and peer groups.
Prerequisites
The configurations for adjusting the BGP network convergence speed are complete.
Procedure
l
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7.13 Configuring BGP Route Dampening

BGP route dampening can be configured to suppress unstable routes.
Applicable Environment
The main cause of route instability is route flapping. A route is considered to be flapping when
it repeatedly appears and then disappears in the routing table. BGP is generally applied to
Issue 01 (2012-03-15)
on BGP peers must be greater than the IGP route convergence time. Otherwise, if IGP route
flapping occurs, the BGP peer relationship will be interrupted before network convergence
is complete.
NOTE
IGP GR is configured and a BGP peer relationship is established based on an IGP route. If a device
becomes faulty and performs an active/standby switchover, the IGP will not delete routes received by
the device. As a result, the BGP peer relationship will not be interrupted, even through BGP tracking
does not take effect.
standby switchover, the delay-time values on the BGP peers must be greater than the GR
time. Otherwise, the BGP peer relationship will be interrupted before the GR time expires.
As a result, GR becomes invalid.
Run the display bgp peer [ verbose ] command to check information about BGP peers.
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