Problem Description

What should be noted in configuring BGP to delete AS numbers?  

Solution

A: 
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.  

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