Huawei Quidway NetEngine80E Configuration Manual page 864

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Route dampening applies only to EBGP routes. IBGP routes, however, cannot be dampened.
Generally, IBGP routes include routes from the local AS, requiring that the forwarding tables
be the same. In addition, IGP fast convergence aims to achieve information synchronization. If
IBGP routes are dampened, dampening parameters vary on different devices, and the forwarding
tables are inconsistent.
Pre-configuration Tasks
Before configuring BGP route dampening, complete the following task:
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Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
Step 3 Run:
ipv4-family unicast
The IPv4 unicast address family view is displayed.
Step 4 Run:
dampening [ half-life-reach reuse suppress ceiling | route-policy route-policy-
name ]
BGP route dampening parameters are set.
When you configure BGP route dampening, the values of reuse, suppress, and ceiling should
meet the relationship of reuse<suppress<ceiling.
If routes are differentiated based on policies and the dampening command is run to reference
a route-policy, BGP can use different route dampening parameters to suppress different routes.
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Checking the Configurations
After BGP route dampening is configured, you can check whether the configuration is correct.
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Issue 02 (2014-09-30)
Configuring Basic BGP Functions
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NOTE
The dampening command takes effect only for EBGP routes.
Run the display bgp routing-table flap-info [ regular-expression as-regular-
expression | as-path-filter as-path-filter-number | network-address [ { mask | mask-
length } [ longer-match ] ] ] command to check route flapping statistics.
Run the display bgp routing-table dampened command to check dampened BGP routes.
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8 BGP Configuration
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