To enable manually configured routing on an asynchronous interface, use the async dynamic routing command in interface configuration mode. To disable routing protocols, use the no form of this command; static routing is still used.

async dynamic routing

no async dynamic 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.

Usage Guidelines

The async dynamic routing command is commonly used to manually bring up PPP from an EXEC session.


The following example shows how to enable manually configured routing on asynchronous interface 1. The ip tcp header-compression passivecommand enables Van Jacobson TCP header compression and prevents transmission of compressed packets until a compressed packet arrives from the asynchronous link.

interface async 1
 async dynamic routing
 async dynamic address
 async default ip address
 ip tcp header-compression passive

A remote user who establishes a PPP or SLIP connection to this asynchronous interface can enable routing by using the /routing switch or theppp/routing command. However, if you want to establish routing by default on connections to an asynchronous interface, use the async default routingcommand when you configure the interface.

Related Commands

Command Description
async default routing Enables the router to pass routing updates to other routers over the AUX port configured as an asynchronous interface.
async dynamic address Specifies dynamic asynchronous addressing versus default addressing.
ip tcp header-compression Enables TCP header compression.

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