Configuring IPv6 BGP Route Attributes 1023Configuring IPv6 BGPRoute AttributesThis section describes how to use IPv6 BGP route attributes to modify BGP routingpolicy. These attributes are:■ IPv6 BGP protocol preference■ Default LOCAL_PREF attribute■ MED attribute■ NEXT_HOP attribute■ AS_PATH attributePrerequisites Before configuring this task, you have:■ Enabled IPv6 function■ Configured IPv6 BGP basic functionsConfiguring IPv6 BGPPreference and DefaultLOCAL_PREF andNEXT_HOP AttributesFollow these steps to configure IPv6 BGP preference and default LOCAL_PREF andNEXT_HOP attributes:n ■ To make sure an IBGP peer can find the correct next hop, you can configureroutes advertised to the peer to use the local router as the next hop. If BGPload balancing is configured, the local router specifies itself as the next hop ofoutbound routes to a peer/peer group regardless of whether the peernext-hop-local command is configured.■ In a “third party next hop” network, that is, the two EBGP peers reside in acommon broadcast subnet, the router does not specify itself as the next hopConfigure IPv6 BGP routedampening parametersdampening [ half-life-reachablehalf-life-unreachable reuse suppressceiling | route-policyroute-policy-name ]*OptionalNot configured bydefaultTo do... Use the command... RemarksTo do... Use the command... RemarksEnter system view system-view -Enter BGP view bgp as-number RequiredEnter IPv6 address family view ipv6-family -Configure preference valuesfor IPv6 BGP external, internal,local routespreference{ external-preferenceinternal-preferencelocal-preference |route-policyroute-policy-name }OptionalThe default preference valuesof external, internal and localroutes are 255, 255, 130respectivelyConfigure the default valuefor local preferencedefault local-preferencevalueOptionalThe value defaults to 100Advertise routes to apeer/peer group with the localrouter as the next hoppeer { ipv6-group-name |ipv6-address }next-hop-localRequiredBy default, the feature isavailable for routes advertisedto the EBGP peer/peer group,but not available to the IBGPpeer/peer group
