3Com S7906E - Switch, Configuration Manual

Page: 1338 / 2621

1-10
To do… Use the command… Remarks
Allow the local AS number to
appear in the AS-PATH of
routes from a peer/peer group
and specify the number of
times that the local AS number
can appear in the AS-PATH of
routes from the peer/peer
group
peer { ipv6-group-name |
ipv6-address
}
allow-as-loop
[ number ]
Optional
Not allowed by default
Disable IPv6 MBGP from
considering the AS_PATH
during best route selection
bestroute as-path-neglect
Optional
Enabled by default
Configure updates to a
peer/peer group to carry only
the public AS number
peer { ipv6-group-name |
ipv6-address } public-as-only
Optional
By default, outbound IPv6
MBGP updates can carry
private AS numbers.
Tuning and Optimizing IPv6 MBGP Networks
Configuration Prerequisites
Before tuning and optimizing an OSPF network, perform the following tasks:
z
Enable IPv6
z
Configure the IPv6 MBGP basic functions
Configuring IPv6 MBGP Soft Reset
After modifying a route selection policy, you have to reset IPv6 MBGP connections to make it take effect,
causing short time disconnections.
After the route-refresh capability is enabled on all IPv6 MBGP routers in a network, when a route
selection policy is modified on a router, the local router can perform dynamic route updates without
tearing down IPv6 MBGP connections.
If the peer does not support route-refresh, you can save all route updates from the peer. When the route
selection policy changes, you can refresh the IPv6 MBGP routing table and apply the new policy without
tearing down IPv6 MBGP connections.
Soft reset through route-refresh
If the peer is enabled with route-refresh, when the IPv6 MBGP route selection policy is modified on a
router, the router advertises a route-refresh message to its IPv6 MBGP peers, which resend their
routing information to the router after receiving the message. Therefore, the local router can perform
dynamic route update and apply the new policy without tearing down IPv6 MBGP connections.
Follow these steps to configure IPv6 MBGP soft reset through route-refresh:
To do… Use the command… Remarks
Enter system view system-view —
Enter BGP view bgp as-number —
Enter IPv6 address family view ipv6-family —