846 CHAPTER 56: BGP CONFIGURATIONc CAUTION:■ Only routes permitted by the specified filter policy can be added into the localBGP routing table.■ Members of a peer group can have different inbound route filter policies fromthe peer group.Enabling BGP and IGPRoute SynchronizationBy default, when a BGP router receives an IBGP route, it only checks thereachability of the route’s next hop before advertisement. With BGP and IGPsynchronization configured, the BGP router cannot advertise the route to EBGPpeers unless the route is also available in the IGP routing table.To configure BGP and IGP synchronization, use the following commands:Configuring BGP RouteDampeningThrough configuring BGP route dampening, you can suppress unstable routes toneither add them to the local routing table nor advertise them to BGP peers.To configure BGP route dampening, use the following commands:n Using this command dampens only routes from EBGP peers rather than IBGPpeers.Configuring BGPRouting AttributesPrerequisites Before configuring this task, you have configured BGP basic functions.Configuration Procedure You can use BGP route attributes to adjust BGP route selection policy.To configure BGP route attributes, use the following commands:To do... Use the command... RemarksEnter system view system-view -Enter BGP view bgp as-number -Enable synchronizationbetween BGP and IGPsynchronization RequiredNot enabled by defaultTo do... Use the command... RemarksEnter system view system-view -Enter BGP view bgp as-number -Configure BGP routedampeningdampening [ half-life-reachablehalf-life-unreachable reuse suppressceiling | route-policyroute-policy-name ] *OptionalNot configured bydefaultTo do... Use the command... RemarksEnter system view system-view -
