1. Run:
system-view
The system view is displayed.
2. Run:
bgp as-number
The BGP view is displayed.
3. Run:
ipv4-family unicast
The IPv4 unicast address family view is displayed.
4. Run:
peer { ipv4-address | group-name } allow-as-loop [ number ]
The local AS number is allowed to repeat in the AS_Path attribute.
Generally, a BGP device checks the AS_Path attribute of a route sent from a peer. If
the local AS number already exists in the AS_Path attribute, BGP ignores this route
to avoid a routing loop.
In some special applications, you can use the peer allow-as-loop command to allow
the AS_Path attributes of routes sent from the peers to contain the local AS number.
You can also set the number of times the local AS number is repeated.
l Configure BGP not to compare AS_Path attributes of routes in the route selection process.
Perform the following steps on a BGP device:
1. Run:
system-view
The system view is displayed.
2. Run:
bgp as-number
The BGP view is displayed.
3. Run:
ipv4-family unicast
The IPv4 unicast address family view is displayed.
4. Run:
bestroute as-path-ignore
BGP is configured to ignore AS_Path attributes of routes during route selection.
l Configure a fake AS number.
Generally, a device supports only one BGP process. This means that a device supports only
one AS number. If AS numbers need to be replaced during network migration, you can run
the peer fake-as command to set a fake AS number for a specified peer to ensure smooth
network migration.
1. Run:
system-view
The system view is displayed.
S6700 Series Ethernet Switches
Configuration Guide - IP Routing 7 BGP Configuration
Issue 01 (2012-03-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
381
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