Configuring The As_Path Attribute; Optimizing Mbgp Networks - HP MSR ASM Configuration Manual

Step
4. Specify the router as the next
hop of routes sent to a peer or a
peer group.

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 it does, MGBP discards the route to avoid routing loops.
To configure the AS-PATH attribute:
Step
1. Enter system view.
2. Enter BGP view.
3. Enter IPv4 MBGP address family view.
4. Configure the AS-PATH attribute.

Optimizing MBGP networks

This task involves resetting MBGP connections and configuring load balancing.
Command
peer { group-name | ip-address }
next-hop-local
Command
system-view
bgp as-number
ipv4-family multicast
•
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:
peer { group-name |
ip-address } allow-as-loop
[ number ]
•
Disable BGP from considering
the AS path during best route
selection:
bestroute as-path-neglect
•
Configure the update
messages to a peer or a peer
group not to carry private AS
numbers in the AS path of
routes:
peer { group-name |
ip-address } public-as-only
210
Remarks
Optional.
By default, MBGP specifies
the local router as the next
hop for routes advertised to
a MBGP EBGP peer or a
peer group, but not for
routes advertised to a
MBGP IBGP peer or a peer
group.
Remarks
N/A
N/A
N/A
Optional.
By default:
•
The local AS number
cannot appear in routes
from a peer/peer
group.
•
BGP considers
AS_PATH during best
route selection.
•
BGP updates carry
private AS numbers.