Creating an autonomous system

Before BGP can be configured, the autonomous system must be configured first. In BGP, routing reachability information is exchanged between autonomous systems (ASs). An AS is a group of networks that share routing information. The autonomous-system command associates an autonomous system number to the router being configured. The autonomous-system command is configured in the config>router context.

Use the following CLI syntax to associate a router to an autonomous system.

CLI syntax

config>router# autonomous-system autonomous-system

The router series supports 4 bytes AS numbers by default. This means autonomous-system can have any value from 1 to 4294967295. The following example displays autonomous system configuration command usage.

Example

config>router# autonomous-system 100

The following example displays the autonomous system configuration:

ALA-B>config>router# info
#------------------------------------------
# IP Configuration
#------------------------------------------
        interface "system"
            address 10.10.10.104/32
        exit
        interface "to-103"
            address 10.0.0.104/24
            port 1/1/1
        exit
        autonomous-system 100

#------------------------------------------
ALA-B>config>router#