Cisco Systems 78-13983-04 manual Configuring Multilink PPP, Configuring IP Address Assignment

Chapter 4 Configuring with the Command-Line Interface

Configuring Multilink Interfaces

Configuring Multilink PPP

As higher-speed services are deployed, Multilink-PPP (MLP) provides a standardized method for spreading traffic across multiple WAN links, while providing multivendor interoperability and load-balancing on both inbound and outbound traffic.

A Multilink interface is a special virtual interface which represents a multilink PPP bundle. The multilink interface serves to coordinate the configuration of the bundled link, and presents a single object for the aggregate links. However, the individual PPP links that are aggregated together, must also be configured. Therefore, to enable Multilink PPP on multiple serial interfaces, you need to first set up the multilink interface, and then configure each of the serial interfaces and add them to the same multilink interface.

The MWR 1900 router can support up to 4 T1 interfaces through the multilink interface.

To set up the multilink interface, do the following beginning in global configuration mode:

Step 1 Specify the multilink interface to be configured.

RPM-3(config)#interface multilink number

Step 2 Enable multilink PPP operation.

RPM-3(config-if)# ppp multilink

Step 3 Specify an identification number for the multilink interface.

RPM-3(config-if)# multilink-groupgroup-number

Step 4 Enable IP processing on a the multilink interface without assigning an explicit IP address to the interface.

RPM-3(config-if)# ip unnumbered loopback number

Where number is the number of the multilink loopback interface that you configured in Configuring Loopback Interfaces.

Configuring IP Address Assignment

A point-to-point interface must be able to provide a remote node with its IP address through the IP Control Protocol (IPCP) address negotiation process. The IP address can be obtained from a variety of sources. The address can be configured through the command line, entered with an EXEC-level command, provided by TACACS+ or the Dynamic Host Configuration Protocol (DHCP), or from a locally administered pool.

IP address pooling uses a pool of IP addresses from which an incoming interface can provide an IP address to a remote node through IPCP address negotiation process. IP address pooling also enhances configuration flexibility by allowing multiple types of pooling to be active simultaneously.

Cisco MWR 1900 Mobile Wireless Edge Router Software Configuration Guide

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