config multilink ppp serial int

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Configure Multilink PPP over

Serial Interface Links

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Configure Multilink PPP over Serial Interface Links

Home > Work With My Routers > Cisco Routers > Configure Multilink PPP over Serial Interface Links

Configure Multilink PPP over Serial Interface Links

Introduction

Requirements

Multilink PPP Overview

Configure Multilink PPP

Verify your Configuration

Next Step

Troubleshoot the Procedure

Related Information

IntroductionThis document describes how to configure Multilink PPP over Serial interface links to reduce latency and jitter for real-time traffic on a Cisco router.

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RequirementsTo perform the steps described in this document, you need to have these items:

Complete the initial configuration in Configure Your Router with Security Device Manager document.

Complete the LAN Addressing Worksheet from the Site Survey.

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Multilink PPP Overview A multilink bundle is a virtual PPP connection over a network link. The transmitting multilink bundle transmits the packetover a network link to a receiving multilink bundle, where the multilink bundle reassembles the fragments using thesequence number in the multilink header of the fragment. The individual member links in a multilink bundle are standard

serial PPP connections.

Multilink PPP provides a method to split, recombine, and sequence datagram’s across multiple logical data links.Multilink PPP allows packets to fragment, and the fragments to be sent at the same time over multiple point-to-point linksto the same remote address. This way, Multilink PPP improves throughput and reduces latency between systems.Before using Multilink PPP over serial interface links, a traffic policy (also known as a policy map) must be created. Apolicy map contains a traffic class, which is used to classify traffic , and one or more QoS feature.

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Configure Multilink PPPFollow these steps to configure multilink PPP on serial interfaces:

Connect to the console of the router. Refer to Create a HyperTerminal Connection.1.

Enter into the interface configuration mode.2.

Define an access list to match the traffic to be sent via the multilink PPP using access-list command followedby a number. This access list permits all ip traffic.

3.

Create a class using the class-map command followed by a name. Map the newly created access list to thisclass using the match command.

4.

Create a traffic policy using the policy-map command followed by a name. Map the newly created class to thispolicy using the class command followed by class name.

5.

Create a multilink bundle interface using interface multilink command followed by multilink bundle number.6.

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Update a service request

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Assign a IP address to this interface using ip address command followed by an IP address and subnet mask.7.

Attach the newly configured traffic policy using service-policy command followed by policy name in both inputand output mode.

8.

Specify the maximum delay time for packet fragments on the multilink PPP interface using ppp multilinkfragment delay command followed by time in milliseconds.

9.

Enable the interleaving of packets among the fragment of larger packets on multilink bundle using ppp multilinkinterleave command.

10.

To associate serial interface to multilink group, follow these steps:

Enter into the interface using interface serial command followed by the slot and port number a.

You can also specify a timeslot at the end of the command if you wish to use only the specific timeslotfor multilink bundle

b.

11.

Set the interface encapsulation method as PPP using encapsulation ppp command. Also, enable multilink onthe interface using ppp multilink command.

12.

Assign this interface to the multilink bundle using ppp multilink group command followed by the multilink groupnumber.

13.

Disable WFQ or DWFQ queuing methods on this serial interface using no fair-queue command.

Repeat steps 11 to 14 to add other serial interfaces to this multilink bundle as required. Save this configurationby getting out of configuration mode using end command, and then enter the copy running-config startup-config command.

14.

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Verify your ConfigurationEnter the show ppp multilink command, and check the output for multilink bundle uptime and its member list.

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Next StepYou have now configured multilink PPP over serial interface links.

Refer to Router Support Page to make further changes to your router.

Refer to Configuration Overview Page to configure other devices in your network.

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Troubleshoot the ProcedureThis section provides information about common problems that you may encounter. If this information does not solveyour problem, contact the SMB Technical Assistance Center (SMB TAC) for assistance.

Problem Cause(s) and Suggested Solution(s)

You have configured the passwords butunable to login to the router.

Perform password recovery refer to Manually Reset thePassword on a Cisco Router .

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Related Information

Router Support PageSite SurveyCreate a HyperTerminal Connection

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