Chapter 11: AI2524 Sync PPP Configuration Steps

Configure Multilink PPP

Multilink PPP (MLP) provides load balancing over multiple WAN links, while providing multivendor interoperability, packet fragmenta- tion and proper sequencing, and load calculation on both inbound and outbound traffic.

Multilink PPP allows packets to be fragmented and the fragments to be sent at the same time over multiple point-to-point links to the sam remote address. The multiple links come up in response to a dialer load threshold that you define. The load can be calculated on inbound traf- fic, outbound traffic, or on either. MLP provides bandwidth on de- mand and reduces transmission latency across WAN links.

Multilink PPP is designed to work over single or multiple interfaces that are configured to support both dial-on-demand rotary groups and PPP encapsulation:

zAsynchronous serial interfaces

zBasic Rate Interfaces (BRIs)

zPrimary Rate Interfaces (PRIs)

Configure Multilink PPP on Asynchronous Interfaces

Beginning in global configuration mode, configure an asynchronous interface to support DDR and PPP encapsulation:

1.Specify an asynchronous interface. interface async number

2.Specify no IP address for the interface. no ip address

3.Enable PPP encapsulation. encapsulation ppp

4.Enable DDR on the interface. dialer in-band

5.Include the interface in a specific dialer rotary group. dialer rotary-groupnumber

Repeat these steps for additional asynchronous interfaces, as needed.

At some point, adding more asynchronous interfaces does not improve performance. With the default maximum transmission unit (MTU) size, Multilink PPP should support three asynchronous interfaces

August 1997

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AIS AI2524 user manual Configure Multilink PPP on Asynchronous Interfaces