Cabletron Systems SmartSwitch Router, User'S Reference Manual

Page: 318 / 338

Chapter 22: WAN Configuration Guide
318 SmartSwitch Router User Reference Manual
The following command line displays an example for a VLAN:
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:
The following command line displays an example for PPP:
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.
interface create ip IPWAN address-netmask 10.50.1.1/16 vlan BLUE
frame-relay set fr-encaps-bgd ports hs.5.2.19
ppp set ppp-encaps-bgd ports hs.5.2