3Com Switch 8800 Advanced Software V5 Configuration Guide

476 CHAPTER 36: IPV6 BGP CONFIGURATION
Configuring IPv6 BGP
and IGP Route
Synchronization
With this feature enabled and when a non-BGP router is responsible for
forwarding packets in an AS, IPv6 BGP speakers in the AS cannot advertise routing
information to outside ASs unless all routers in the AS know the latest routing
information.
By default, when a BGP router receives an IBGP route, it only checks the
reachability of the route’s next hop before advertisement. If the synchronization
feature is configured, only the IBGP route is advertised by IGP can the route be
advertised to EBGP peers.
To configure IPv6 BGP and IGP route synchronization, use the following
commands:
Configuring Route
Dampening
To configure BGP route dampening, use the following commands:
Configuring IPv6 BGP
Route Attributes
This section describes how to use IPv6 BGP route attributes to modify BGP routing
policy. These attributes are:
■ IPv6 BGP protocol preference
■ Default LOCAL_PREF attribute
■ MED attribute
■ NEXT_HOP attribute
■ AS_PATH attribute
Prerequisites Before configuring this task, you have:
■ Enabled IPv6 function
■ Configured IPv6 BGP basic functions
To do... Use the command... Remarks
Enter system view system-view -
Enter BGP view bgp as-number Required
Enter IPv6 address family view ipv6-family -
Enable route synchronization
between IPv6 BGP and IGP
synchronization Required
Not enabled by default
To do... Use the command... Remarks
Enter system view system-view -
Enter BGP view bgp as-number Required
Enter IPv6 address family view ipv6-family -
Configure IPv6 BGP route
dampening parameters
dampening [
half-life-reachable
half-life-unreachable reuse
suppress ceiling |
route-policy
route-policy-name ]*
Optional
Not configured by default