H3C Technologies H3C S12500 Series Switches - Manual (Page 243)

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Step Command Remarks
4. Specify the switch as the next
hop of routes sent to a peer/peer
group.
peer { group-name | ip-address }
next-hop-local
Optional.
By default, the next hop of
routes sent to a MBGP
EBGP peer/peer group is
the advertising router, but
that of routes sent to a
MBGP IBGP peer/peer
group is not.
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 configure the AS_PATH attribute:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view. bgp as-number N/A
3. Enter IPv4 MBGP address family view. ipv4-family multicast N/A
4. Specify the maximum number of times
the local AS number can appear in
routes from the peer/peer group.
peer { group-name | ip-address }
allow-as-loop [ number ]
Optional.
By default, the local AS
number cannot appear in
routes from a peer/peer
group.
5. Disable BGP from considering the
AS_PATH during best route selection. bestroute as-path-neglect
Optional.
By default, BGP considers
AS_PATH during best route
selection.
6. 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.
Optimizing MBGP networks
This task involves resetting MBGP connections and configuring load balancing.
Configuration prerequisites
Before you configure this task, configure basic MBGP.
Configuring MBGP soft reset
After modifying a route selection policy, you have to reset MBGP connections to make it take effect.