Configuring Rate Limiting For Frame Relay; Overview; Rate Limiting; Frf.12 - HP 7102dl - ProCurve Secure Router Configuration Manual

Setting Up Quality of Service

Configuring Rate Limiting for Frame Relay

Configuring Rate Limiting for Frame
Relay

Overview

Rate limiting helps to maintain QoS on a Frame Relay connection and to
minimize the number of packets dropped during congestion.

Rate Limiting

The permanent virtual circuits (PVCs) established on a Frame Relay connec-
tion must share the bandwidth available to the carrier line. (For information
on how to increase this bandwidth by aggregating several carrier lines, see
Chapter 2: Increasing Bandwidth.) You can configure rate limiting to pre-
serve QoS on each PVC.
Rate limiting defines the maximum amount of bandwidth a PVC is allowed to
consume. You can set different rate limits for when the line is congested and
when it is free.

FRF.12

When running voice or other real-time, delay-sensitive applications over a
Frame Relay interface, you may want to fragment Frame Relay frames.
Fragmenting frames reduces latency and improves performance. You should
use fragmentation for lower-speed connections, particularly those with
speeds of 512 Kbps or less.
VoIP traffic is sensitive to delay. The quality of a voice transmission is seriously
decreased if its delay is more than 150 ms. Transmission delays accumulate
at several points: they include, for example, the time it takes the router to
process and encapsulate a frame and to transmit the frame across the WAN
connection.
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