Tuning And Optimizing Mbgp Networks; Configuring Mbgp Soft Reset - HP 6125G Configuration Manual

Step
1. Enter system view.
2. Enter BGP view.
3. Enter IPv4 MBGP address
family view.
4. Allow the local AS number to
appear in the AS_PATH of
routes from a peer or a peer
group and specify the number
of times that the local AS
number can appear in the
AS_PATH of routes from the
peer or the peer group.
5. Disable BGP from considering
the AS_PATH during best
route selection.
6. Configure updates to a peer
or a peer group not to keep
private AS numbers.

Tuning and optimizing MBGP networks

This task involves resetting MBGP connections and configuring load balancing.
Before configuring this task, configure basic MBGP functions first.

Configuring MBGP soft reset

After modifying a route selection policy, you have to 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.
However, if a peer that does not support route refresh exists in the network, you must configure the peer
keep-all-routes command to save all routes from the peer. When the routing policy is changed, the
system updates the MBGP routing table and applies the new policy.
Performing 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 terminating MBGP connections.
To perform soft reset through route refresh:
Step
1. Enter system view.
2. Enter BGP view.
Command
system-view
bgp as-number
ipv4-family multicast
peer { group-name | ip-address }
allow-as-loop [ number ]
bestroute as-path-neglect
peer { group-name | ip-address }
public-as-only
Command
system-view
bgp as-number
195
Remarks
N/A
N/A
N/A
Optional.
By default, the local AS number
cannot appear in routes from a
peer or a peer group.
Optional.
By default, BGP considers
AS_PATH during best route
selection.
Optional.
By default, BGP updates carry
private AS numbers.
Remarks
N/A
N/A