Tuning And Optimizing Mbgp Networks; Configuration Prerequisites; Configuring Mbgp Soft Reset - HP A5500 SI Switch Series Configuration Manual

To do...
Configure updates to a peer/peer group
to not keep private AS numbers

Tuning and optimizing MBGP networks

This task involves resetting MBGP connections and configuring load balancing.

Configuration prerequisites

Before you configure this task, configure BGP basic functions.

Configuring MBGP soft reset

After modifying a route selection policy, you must reset MBGP connections to make it take effect.
The current MBGP implementation supports the route-refresh feature that enables dynamic route refresh
without terminating MBGP connections.
If a peer that does not support route refresh exists in the network, you must use the peer keep-all-routes
command to save all routes from the peer. When the routing policy is changed, the system will update
the MBGP routing table and apply the new policy.
Soft reset through route-refresh
If the peer is enabled with route refresh, when the MBGP route selection policy is modified on a switch,
the switch advertises a route-refresh message to its MBGP peers. The MBGP peers resend their routing
information to the switch after they receive the message. Therefore, the local switch can perform
dynamic route update and apply the new policy without terminating MBGP connections.
Follow these steps to configure MBGP soft reset through route-refresh:
To do...
Enter system view
Enter BGP view
Enable BGP route refresh for a
peer/peer group
Perform a manual soft reset
If the peer does not support route refresh, use the peer keep-all-routes command to save all the route
updates from the peer. Then use the refresh bgp ipv4 multicast command to soft-reset MBGP connections
to refresh the MBGP routing table and apply the new policy without terminating MBGP connections.
Follow these steps to configure MBGP manual soft reset
To do...
Enter system view
Enter BGP view
Use the command...
peer { group-name | ip-address }
public-as-only
Use the command...
system-view
bgp as-number
peer { group-name | ip-address }
capability-advertise route-refresh
Use the command...
system-view
bgp as-number
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Remarks
Optional
By default, BGP updates
carry private AS numbers.
Remarks
—
—
Optional
Enabled by default
Remarks
—
—