Operation Manual – Routing ProtocolH3C S7500 Series Ethernet Switches Chapter 6 BGP Configuration6-14Caution:BGP-IGP route synchronization is not supported on the H3C S7500 series Ethernetswitches.6.4.8 Configuring BGP Route DampeningRoute dampening is used to solve the problem of route instability. Route instabilitymainly refers to route flapping. A route flaps if it appears and disappears repeatedly inthe 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 previoustime period. Once a route flaps, it receives a certain penalty value. When the penaltyvalue reaches the suppression threshold, this route is suppressed. The penalty valuedecreases with time. When the penalty value of a suppressed route decreases to thereuse threshold, the route gets valid and is thus advertised again.BGP dampening suppresses unstable routing information. Suppressed routes areneither added to the routing table nor advertised to other BGP peers.Follow these steps to configure BGP route dampening:To do... Use the command... RemarksEnter system view system-view —Enter BGP view bgp as-number —Configure BGProutedampening-relatedparametersdampening[ half-life-reachablehalf-life-unreachablereuse suppress ceiling ][ route-policyroute-policy-name ]RequiredBy default, route dampening isdisabled. Other default routedampening-related parametersare as follows.z half-life-reachable: 15 (inminutes)z half-life-unreachable: 15 (inminutes)z reuse: 750z suppress: 2,000z ceiling: 16,0006.4.9 Configuring BGP Load BalanceFollow these steps to configure BGP load balance:
