AIS AI2524 Configure Payload Compression, Configure TCP/IP Header Compression, Packet-rate

Chapter 13: AI2524 Frame Relay Configuration Steps

interface buffers and lead to higher packet rate loss for both user dat and routing updates.

To avoid such problems, you can create a special broadcast queue for an interface. The broadcast queue is managed independently of th normal interface queue, has its own buffers, and has a configurable size and service rate.

A broadcast queue is given a maximum transmission rate (throughput) limit measured in both bytes per second and packets per second. The queue is serviced to ensure that no more than this maximum is pro vided. The broadcast queue has priority when transmitting at a rate below the configured maximum, and hence has a guaranteed minimum bandwidth allocation. The two transmission rate limits are intended to avoid flooding the interface with broadcasts. The actual transmission rate limit in any second is the first of the two rate limits that is reached.

In interface configuration mode, create a broadcast queue:

frame-relay broadcast-queue size byte-rate

packet-rate

Configure Payload Compression

You can configure payload compression on point-to-point or multi point interfaces or subinterfaces. Payload compression uses the stac method to predict what the next character in the frame will be. Becaus the prediction is done packet-by-packet, the dictionary is not con served across packet boundaries.

Payload compression on each virtual circuit consumes approximately 40 kilobytes for dictionary memory.

zConfigure payload compression on a specified multipoint inter- face or subinterface:

frame-relay map protocol protocol-address dlci

payload-compress packet-by-packet

zConfigure payload compression on a specified point-to-point in- terface or subinterface:

frame-relay payload-compress packet-by- packet

Configure TCP/IP Header Compression

TCP/IP header compression, as described by RFC 1144, is designed to improve the efficiency of bandwidth use over low-speed serial links.

August 1997	Page 13-39
2524UM