CHAPTER
23-1
ATM Switch Router Software Configuration Guide
OL-7396-01
23
Configuring the ATM Traffic-Shaping Carrier Module
This chapter describes the features and configuration procedures for the ATM traffic-shaping carrier
module (TSCAM). The TSCAM is available on the Catalyst 8 510 MSR and the LightStream 1010 ATM
switch routers.
Note This chapter provides advanced configuration instructions for the Catalyst8510 MSR and
LightStream 1010 ATM switch routers. For complete descriptions of the commands mentione d in this
chapter, refer to the ATM and Layer 3 Switch Router Command Reference publication.
This chapter includes the following sections:
About the ATM Traffic-Shaping Carrier Module, page 23-1
Hardware and Software Restrictions, page 23-3
Configuring the ATM TSCAM, page 23-4
Configuring Maximum Thresholds, page 23-5
Displaying Traffic-Shaping Configurations, page 23-7
Traffic-shaping Granularity Tables, page 23-9

About the ATM Traffic-Shaping Carrier Module

The ATM traffic-shaping carrier module (TSCAM) augments the current traffic-shaping capabilities for
the Catalyst 8510 MSR and the LightStream1010 ATM switch routers by providing variable bit rate
(VBR) and best-effort traffic-shaping capabilities. The TSCAM shapes the streams of cells sent over
virtual connections (VCs) so they conform to bandwidth parameters, and they do not exceed the expected
flow into the network. The TSCAM does this by temporarily holding cells in buffers and dispersing them
as bandwidth parameters allow on the outgoing connection. The TSCAM helps ensure that cells are not
dropped if they exceed the maximum traffic-flow parameters established between private and public
networks.
You can enable traffic shaping on subcard0 of a slot that is equipped with the TSCAM. For OC-3, T1,
E1, and DS3 port adapters, a maximum of four traffic classes can be shap ed. For example, if only VBR
traffic is shaped, traffic shaping for VBR can be configured on a maximum of four ports (each port
shapes two classes). If VBR traffic and best-effort traffic is shaped, a maximum of two ports can be
configured for traffic shaping. For OC-12 port adapters, only one traffic class can be shaped.