Cabletron Systems SmartSwitch manual Forcing Bridged Encapsulation, Packet Compression

Chapter 22: WAN Configuration Guide

The following command line displays an example for a VLAN:

interface create ip IPWAN address-netmask 10.50.1.1/16 vlan BLUE

Forcing Bridged Encapsulation

WAN for the SSR has the ability to force bridged packet encapsulation. This feature has been provided to facilitate seamless compatibility with Cisco routers, which expect bridged encapsulation in certain operating modes.

The following command line displays an example for Frame Relay:

frame-relay set fr-encaps-bgd ports hs.5.2.19

The following command line displays an example for PPP:

ppp set ppp-encaps-bgd ports hs.5.2

Packet Compression

Packet compression can increase throughput and shorten the times needed for data transmission. You can enable packet compression for Frame Relay VCs and for PPP ports, however, both ends of a link must be configured to use packet compression.

Enabling compression on WAN serial links should be decided on a case by case basis. Important factors to consider include:

•average packet size

•nature of the data

•link integrity

•latency requirements

Each of these factors is discussed in more detail in the following sections and should be taken into consideration before enabling compression. Since the factors are dependent on the environment, you should first try running with compression histories enabled. If compression statistics do not show a very good long-term compression ratio, then select the “no history” option. If the compression statistics do not improve or show a ration of less than 1, then compression should be disabled altogether.

318 SmartSwitch Router User Reference Manual