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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Allowing an AS Number to Appear in its Own AS Path

This command allows you to set the number of times a particular AS number can occur in the AS path.

The allow-as feature permits a BGP speaker to allow the ASN to be present for a specified number of times in the update received from the peer, even if that ASN matches its own. The AS-PATH loop is detected if the local ASN is present more than the specified number of times in the command.
Allow this neighbor ID to use the AS path the specified number of times. CONFIG-ROUTER-BGP mode neighbor { IP address | peer-group-name} allowas-in number
  • Peer Group Name : 16 characters.
  • Number : 1 through 10.
Format: IP Address: A.B.C.D. You must use Configuring Peer Groups ’before assigning it to an AS.

Example of Viewing AS Numbers in AS Paths

The lines shown in bold are the number of times ASN 65123 can appear in the AS path ( allows–in 9).

To disable this feature, use the no neighbor allow-as in number command in CONFIGURATION ROUTER BGP mode. 

R2(conf-router_bgp)#show conf
                                 !
                                 router bgp 65123
                                 bgp router-id 192.168.10.2
                                 network 10.10.21.0/24
                                 network 10.10.32.0/24
                                 network 100.10.92.0/24
                                 network 192.168.10.0/24
                                 bgp four-octet-as-support
                                 neighbor 10.10.21.1 remote-as 65123
                                 neighbor 10.10.21.1 filter-list Laura in
                                 neighbor 10.10.21.1 no shutdown
                                 neighbor 10.10.32.3 remote-as 65123
                                 neighbor 10.10.32.3 no shutdown
                                 neighbor 100.10.92.9 remote-as 65192
                                 neighbor 100.10.92.9 local-as 6500
                                 
                                  neighbor 100.10.92.9 no shutdown
                                    neighbor 192.168.10.1 remote-as 65123
                                    neighbor 192.168.10.1 update-source Loopback 0
                                    
                                   neighbor 192.168.10.1 no shutdown

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