To enable the router to pass routing updates to other routers over an asynchronous interface, use the async default routing command in interface configuration mode. To disable dynamic addressing, use the no form of this command.

async default routing

no async default routing

Syntax Description

This command has no arguments or keywords.

Command Default


Command Modes

Interface configuration

Command History

Release Modification
10.0 This command was introduced.
12.3(11)T This command was replaced by the routing dynamic command.

Usage Guidelines

Use the async default routing command to define the default behavior for router-to-router communication over connections to the AUX port configured as an asynchronous interface. This command is commonly used to enable two routers to communicate over an async dial backup link.

To require a remote user to manually configure routing over connections to the AUX port configured as an asynchronous interface, use the async dynamic routing command.


The following example enables routing over asynchronous interface 0:

interface async 0
 async default routing

Related Commands

Command Description
async dynamic routing Enables manually configured routing on an asynchronous interface.

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