Enterprise QoS Solution Reference Network Design Guide

Catalyst 3550—QoS Considerations and Design
show wrr-queue cos-map
2-28
Example 2-12 Catalyst 2950 CoS-to-Queue Mapping Example
Enterprise QoS Solution Reference Network Design Guide
Chapter 2 Campus QoS Design
CAT2950(config)#wrr-queue cos-map 1 1 ! Scavenger/Bulk is assigned to Q1
CAT2950(config)#wrr-queue cos-map 2 0 ! Best Effort is assigned to Q2
CAT2950(config)#wrr-queue cos-map 3 2 3 4 6 7 ! CoS 2,3,4,6,7 are assigned to Q3
CAT2950(config)#wrr-queue cos-map 4 5 ! VoIP is assigned to Q4 (PQ)
CAT2950(config)#
The show wrr-queue cos-map verification command displayst he queue that each CoS value has been
assigned to.
In the example below, CoS 0 (Best Effort) is assigned to Q2 and CoS 1 (Scavenger) has been assigned
to Q1. CoS values 2, 3, 4, 6 and 7 have all been assigned to Q3 and CoS 5 (Voice) has been assigned to
the priority-queue, Q4.
Example 2-13 Show WRR-Queue CoS Map Verification for a Catalyst 2950 Switch
CAT2950#show wrr-queue cos-map
CoS Value : 0 1 2 3 4 5 6 7
Priority Queue : 2 1 3 3 3 4 3 3
CAT2950#
Catalyst 3550—QoS Considerations and Design
This section includes the following topics:
Catalyst 3550—Trusted Endpoint Model
Catalyst 3550—AutoQoS VoIP Model
Catalyst 3550—Untrusted PC + SoftPhone with Scavenger-Class QoS Model
Catalyst 3550—Untrusted Server with Scavenger-Class QoS Model
Catalyst 3500—Conditionally-Trusted IP Phone + PC with Scavenger-Class QoS (Basic) Model
Catalyst 3550—Conditionally-Trusted IP Phone + PC with Scavenger-Class QoS (Advanced)
Model
Catalyst 3550—Queuing and Dropping
The Catalyst 3550 supports IP routing and so may be found in either the access or distribution layer of
the campus.
Regarding QoS, the Catalyst 3550 supports a richer feature set than the Catalyst 2950, including an
advanced policing feature that is ideal for out-of-profile policing, namely, per-port/per-VLAN policing.
The access layer design options and distribution layer design recommendations for a Catalyst 3550 are
shown in Figure 2-13 and Figure 2-14, respectively.
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