Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 169

Only after the peer group responds to an OPEN message sent on the subnet does its BGP state change to ESTABLISHED. Once the peer group is ESTABLISHED, the peer group is the same as any other peer group. For more information on peer groups, refer to Configure Peer Groups on page 162. Maintain existing AS numbers during an AS migration The local-as feature smooths out the BGP network migration operation and allows you to maintain existing ASNs during a BGP network migration. When you complete your migration, be sure to reconfigure your routers with the new information and disable this feature. Command Syntax neighbor {IP address | peer-group-name local-as as number [no prepend] Command Mode CONFIG-ROUTERBGP Purpose Allow external routes from this neighbor. Format: IP Address: A.B.C.D Peer Group Name: 16 characters AS-number: 0-65535 (2-Byte) or 1-4294967295 (4-Byte) or 0.1-65535.65535 (Dotted format) No Prepend specifies that local AS values are not prepended to announcements from the neighbor. You must Configure Peer Groups before assigning it to an AS. This feature is not supported on passive peer groups. Disable this feature, using the no neighbor local-as command in CONFIGURATION ROUTER BGP mode. Border Gateway Protocol IPv4 (BGPv4) | 169