Enterprise QoS Solution Reference Network Design Guide

Chapter 2 Campus QoS Design
Catalyst 6500 CatOS QoS Verification Commands
Version 3.3
Catalyst 6500 PFC2/PFC3—QoS Considerations and Design
Catalyst 6500 CatOS QoS verification commands for the Conditionally-Trusted IP Phone + PC +
Scavenger (Basic) Model
include the following:
show qos status
show qos maps
show port qos
show qos acl
show qos policer
show qos statistics
Note As previously mentioned, on non-GigabitEthernet linecards that use 2Q2T Transmit Queuing and 1Q4T
Receive queuing (such as the WS-X6248-RJ-xx and the WS-X6348-RJ-xx), a hardware limitation
prevents the proper functioning of port-based trust (which affects trust-cos, trust-ipprec, and trust-dscp).
On such linecards, a workaround ACL can be used to achieve trust functionality. For such an example,
see the Catalyst 6500 Trusted Endpoint Model section (Example 2-50) of this chapter.
Catalyst 6500—Conditionally-Trusted IP Phone + PC with Scavenger-Class QoS
(Advanced) Model
This section includes the following topics:
Configuration
Catalyst 6500 CatOS QoS Verification Commands
The Catalyst 6500 Conditionally-Trusted IP Phone + PC + Scavenger (Advanced) Model leverages the
Dual-Rate Policing capabilities of the PFC2/PFC3. This feature is described in the Catalyst 6500
Untrusted Server + Scavenger section of this chapter (which applies the feature to Server-to-Client
flows). In this example, the Dual-Rate Policing feature is applied to Client-to-Server flows to
complement the Untrusted Server + Scavenger Model.
Dual-Rate Policing, in this context, allows for graduated markdown of Interactive-Video (from PCs),
Transactional Data, and Bulk Data. Specifically, in this example Interactive-Video is marked down to
AF42 if it is in excess of 300 kbps but less than 500 kbps; if it is greater than 500 kbps, it is marked down
to Scavenger (CS1). Similarly, Transactional Data and Bulk Data are marked down to AF22 and AF12
(respectively) if they are in excess of 3 Mbps but less than 5 Mbps; if they are in excess of 5 Mbps, then
they are both marked down to Scavenger (CS1). All other policers are consistent with the single-rate
policer model.
The Catalyst 6500 PFC2/PFC3 Conditionally-Trusted Endpoint Dual-Rate Policing—IP Phone + PC +
Scavenger (Advanced) Model is illustrated in Figure 2-25.
Enterprise QoS Solution Reference Network Design Guide
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