Configure a Local AS Number for a BGP4 Device

The local autonomous system number (ASN) identifies the autonomous system in which the BGP device resides.

About this task

If the ASN of the organization is unknown, use a well-known private ASN in the range from 64512 through 65535.

Access global configuration mode.
```
device# configure terminal
```
Access BGP router configuration mode.
```
device(config)# router bgp
```
Specify the ASN for the autonomous system in which your device resides.
```
device(config-bgp-router)# local-as 1000
```

The following example summarizes the commands in this procedure.

device# configure terminal
device(config)# router bgp
device(config-bgp-router)# local-as 1000