Configuring Bgp Route Dampening; Configuring Bgp Load Balance - H3C S7500 Series Operation Manual

Operation Manual – Routing Protocol
H3C S7500 Series Ethernet Switches
Caution:
BGP-IGP route synchronization is not supported on the H3C S7500 series Ethernet
switches.

6.4.8 Configuring BGP Route Dampening

Route dampening is used to solve the problem of route instability. Route instability
mainly refers to route flapping. A route flaps if it appears and disappears repeatedly in
the routing table. Route flapping increases the number of BGP update packets,
consumes the bandwidth and CPU time, and even decreases network performance.
Assessing the stability of a route is based on the behavior of the route in the previous
time period. Once a route flaps, it receives a certain penalty value. When the penalty
value reaches the suppression threshold, this route is suppressed. The penalty value
decreases with time. When the penalty value of a suppressed route decreases to the
reuse threshold, the route gets valid and is thus advertised again.
BGP dampening suppresses unstable routing information. Suppressed routes are
neither added to the routing table nor advertised to other BGP peers.
Follow these steps to configure BGP route dampening:
To do...
Enter system view
Enter BGP view
Configure BGP
route
dampening-related
parameters

6.4.9 Configuring BGP Load Balance

Follow these steps to configure BGP load balance:
Use the command...
system-view
bgp as-number
dampening
[ half-life-reachable
half-life-unreachable
reuse suppress ceiling ]
[ route-policy
route-policy-name ]
6-14
Chapter 6 BGP Configuration
Remarks
—
—
Required
By default, route dampening is
disabled. Other default route
dampening-related parameters
are as follows.
half-life-reachable:
minutes)
half-life-unreachable: 15 (in
minutes)
reuse: 750
suppress: 2,000
ceiling: 16,000
15 (in