R2511-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V5)

206
Step Command Remarks
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ipv4-family vpn-instance
vpn-instance-name
Use either method.
3. Configure the maximum
number of BGP routes for load
balancing.
balance number
By default, load balancing is not
enabled.
Forbidding session establishment with a peer or peer group
This task allows you to temporarily tear down the BGP session to a specific peer or peer group. To recover
the session, execute the undo peer ignore command. In this way, you can implement network upgrade
and maintenance without deleting and then configuring the peer or peer group.
To forbid session establishment with a peer or peer group:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ipv4-family vpn-instance
vpn-instance-name
Use either method.
3. Forbid session establishment
with a peer or peer group.
peer { group-name | ip-address }
ignore
Not forbidden by default.
Configuring BGP soft-reset
After modifying the route selection policy, you must reset BGP sessions to make the new policy take effect
and advertise new routes. The router then filters routing information by using the new policy.
The soft-reset feature allows you to refresh the BGP routing table and apply the new route selection policy
without tearing down BGP sessions.
The following soft-reset methods are available:
• Automatic soft-reset—After a policy is modified, the router advertises a Route-refresh message to
the peers, which then resend their routing information to the router. After receiving the routing
information, the router filters the routing information by using the new policy.
This method requires that both the local router and the peer support route refresh.
• Manual soft-reset—Use the peer keep-all-routes command to save all route updates from the peer.
After modifying the route selection policy, use the refresh bgp command to filter routing information
by using the new policy.
This method uses more memory resources to save routes and does not require that the local router
and the peer support route refresh.