Specifications

10-9
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
Chapter 10 Traffic Shaping
Frame Relay Traffic Shaping
For information on traffic shaping commands, see the Cisco IOS Quality of
Service Solutions Command Reference, Release 12.2 manual:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos
_r/index.htm
Restrictions
Peak and average traffic shaping is configured on a per-interface or per-class
basis, and cannot be used in conjunction with commands used to configure GTS
from previous versions of Cisco IOS. These commands include the following:
• traffic-shape adaptive
• traffic-shape fecn-adaptive
• traffic-shape group
• traffic-shape rate
Adaptive traffic shaping for Frame Relay networks is not supported using the
Class-Based Shaping feature. To configure adaptive GTS for Frame Relay
networks, you must use the commands from releases prior to Release 12.1(2) of
Cisco IOS software.
Frame Relay Traffic Shaping
Cisco has long provided support for FECN for DECnet and OSI, and BECN for
Systems Network Architecture (SNA) traffic using Logical Link Control, type 2
(LLC2) encapsulation via RFC 1490 and DE bit support. FRTS builds upon this
existing Frame Relay support with additional capabilities that improve the
scalability and performance of a Frame Relay network, increasing the density of
VCs and improving response time.
As is also true of GTS, FRTS can eliminate bottlenecks in Frame Relay networks
that have high-speed connections at the central site and low-speed connections at
branch sites. You can configure rate enforcement—a peak rate configured to limit
outbound traffic—to limit the rate at which data is sent on the VC at the central
site.