Configuring The As-Path Attribute; Tuning And Optimizing Mbgp Networks; Prerequisites; Configuring Mbgp Soft Reset - HP A6600 Configuration Manual

Configuring the AS-PATH attribute

In general, MBGP checks whether the AS-PATH attribute of a route from a peer contains the local AS
number. If yes, it discards the route to avoid routing loops.
To do...
1. Enter system view.
2. Enter BGP view.
3. Enter IPv4 MBGP address family view.
4. Configure
the
AS_PATH
attribute.

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.
The current MBGP implementation supports the route-refresh feature that enables dynamic route refresh
without terminating MBGP connections.
However, if a peer not supporting route-refresh exists in the network, you need to configure 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.
Use the command...
system-view
bgp as-number
ipv4-family multicast
a. Specify the
maximum
number of times
the local AS
peer { group-name | ip-address }
number can
allow-as-loop [ number ]
appear in routes
from the
peer/peer
group.
b. Disable BGP
from
considering the
bestroute as-path-neglect
AS_PATH during
best route
selection.
c. Configure
updates to a
peer/peer
peer { group-name | ip-address }
group to not
public-as-only
keep private AS
numbers.
201
Remarks
—
—
—
Optional.
By default, the local AS
number can not appear in
routes from a peer/peer
group.
Optional.
By default, BGP considers
AS_PATH during best route
selection.
Optional.
By default, BGP updates
carry private AS numbers.