H3C Technologies H3C S7500E Series Switches - Manual (Page 246)

8-12
To do… Use the command… Remarks
Configure updates to a
peer/peer group to not
keep private AS
numbers
peer { group-name | ip-address }
public-as-only
Optional
By default, BGP updates
carry private AS numbers.
Tuning and Optimizing MBGP Networks
This task involves resetting MBGP connections and configuring load balancing.
Prerequisites
You need to configure BGP basic functions before configuring this task.
Configuring MBGP Soft Reset
After modifying a route selection policy, you have to reset MBGP connections to make it take effect,
causing short time disconnections.
After the route-refresh capability is enabled on all 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
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 MBGP routing table and apply the new policy
without tearing down MBGP connections.
Soft reset through route-refresh
If the peer is enabled with route-refresh, when the MBGP route selection policy is modified on a router,
the router advertises a route-refresh message to its 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 MBGP connections.
Follow these steps to configure MBGP soft reset through route-refresh:
To do… Use the command… Remarks
Enter system view system-view —
Enter BGP view bgp as-number —
Enable BGP route refresh for a
peer/peer group
peer { group-name | ip-address }
capability-advertise
route-refresh
Optional
Enabled by default
Perform a manual soft reset
If the peer does not support route-refresh, you can use the peer keep-all-routes command to save all
the route updates from the peer, and then use the refresh bgp ipv4 multicast command to soft-reset