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FAQ-What Should Be Noted in Configuring BGP to Delete AS Numbers

Publication Date:  2012-07-27 Views:  2 Downloads:  0
Issue Description
What should be noted in configuring BGP to delete AS numbers? 
Alarm Information
Handling Process
On the NE80E, the command for removing the AS number is peer { ip-address | group-name } public-as-only. Generally, BGP update packets carry the AS numbers, which may be public and/or private AS numbers.
After this command is configured, if the AS_Path attribute carried in BGP routing information contains only private AS numbers, BGP deletes these private AS numbers before advertising such routing information.
This command is applicable to only EBGP peers.
In the following cases, after the preceding command is configured, BGP does not delete private AS numbers:
1. The AS_Path of the route contains the AS number of the peer. In this case, deleting private AS numbers may cause route loops.
2. The AS_Path list contains both public and private AS numbers. This indicates that the route has passed the public network. Deleting private AS numbers may cause forwarding errors. In other words, this command is applicable only to the routes consisting of only private ASs. 
Root Cause