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Table Of Contents

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

neighbor 192.168.12.2 remote-as 65123

neighbor 192.168.12.2 update-source Loopback 0

neighbor 192.168.12.2 no shutdown

R2(conf-router_bgp)#

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 Configure Peer Groups before assigning it to an AS.

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