Enterprise QoS Solution Reference Network Design Guide

Chapter 2 Campus QoS Design
Version 3.3
Catalyst 2970/3560/3750—QoS Considerations and Design
CAT2970(config-ext-nacl)#
CAT2970(config-ext-nacl)#ip access list extended DVLAN-BULK-DATA
CAT2970(config-ext-nacl)# permit tcp any any eq 143 ! IMAP
CAT2970(config-ext-nacl)# permit tcp any any eq 220 ! IMAP
CAT2970(config-ext-nacl)#end
CAT2970#
Note At the time of writing, the Catalyst 2970/3560/3750 does not support a trust statement (such as mls qos
trust device cisco-phone) in conjunction with a service-policy input statement applied to given port at
the same time. While this may be configurable, if the switch is reset, one or the other statement may be
removed when the switch reloads. This limitation is to be addressed; consult the latest Catalyst
2970/3560/3750 QoS documentation for updates on this limitation.
Catalyst MLS QoS Verification Commands
Catalyst MLS QoS verification commands for the Conditionally-Trusted IP Phone + PC + Scavenger
(Advanced) Model include the following:
show mls qos
show mls qos map
show mls qos interface
show mls qos interface policers
show class-map
show policy-map
show policy interface
Catalyst 2970/3560/3750—Queuing and Dropping
Configuration
This section includes the following topics:
Configuration
Catalyst MLS QoS Verification Commands
For the most part, the Catalyst 2970/3560/3750 is relatively compatible in QoS features and syntax with
the Catalyst 3550, except with respect to queuing and dropping.
The Catalyst 2970/3560/3750 supports four egress queues, which can be configured on a per-interface
basis to operate in either 4Q3T or 1P3Q3T modes. Additionally, the Catalyst 2970/3560/3750 supports
two queue-sets, allowing certain interfaces to be configured in one manner and others to be configured
in a different manner. For example, some interfaces may be assigned to Queue Set (qset) 1 operating in
4Q3T mode, while others may be assigned to Queue Set 2 operating in 1P3Q3T mode.
However, unlike the Catalyst 2950 and 3550, the Catalyst 2970/3560/3750 has Queue 1 (not Queue 4)
as the optional priority queue. In a converged campus environment it is recommended to enable the
priority queue via the priority-queue out interface command.
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