Cisco Systems 4500 Multi-attribute Marking Support, Hardware Capabilities for Marking, Configuring the Policy-Map Marking Action

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Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 37 Configuring Quality of Service Configuring QoS on Supervisor Engine 6-E, Supervisor Engine 6L-E, Catalyst 4900M, and Catalyst 4948E
Multi-attribute Marking Support
Catalyst 4900M, Catalyst 4948E, Supervisor Engine 6-E, and Supervisor Engine 6L-E can mark more
than one QoS attribute of a packet matching a class of traffic. For example, DSCP, CoS, and QoS-group
can all be set together, using either explicit or table map-based marking.
Note When using unconditional explicit marking of multiple fields or policer-based multifield, multiregion
(conform/exceed/violate) marking the number of table maps that can be set up in ToS or CoS marking
tables will be less than the maximum supported.
Hardware Capabilities for Marking
Catalyst 4900M, Catalyst 4948E, Supervisor Engine 6-E, and Supervisor Engine 6L-E provide a 128
entry marking action table where each entry specifies the type of marking actions on CoS and
DSCP/Precedence fields as well as policer action to transmit/markdown/drop a packet. One such table
is supported for each direction, input and output. This table is used for both unconditional marking as
well as policer-based marking. It can be used to support 128 unique marking actions or 32 unique
policer-based actions or a combinations of the two.
For each of the marking fields (CoS and DSCP), Catalyst 4900M, Catalyst 4948E, Supervisor Engine
6-E, and Supervisor Engine 6L-E provide 512 entry marking tables for each direction. These are similar
to mapping tables available on supervisor engines that support the switch QoS model. However, these
provide an ability to have multiple unique mapping tables that are set up by the user.
For example, the ToS marking table provides marking of DSCP/Precedence fields and can be used as one
of the following:
• 8 different table maps with each mapping the 64 DSCP or qos-group values to another DSCP
• 64 (32) different table maps with each one mapping eight CoS (16 CoS and CFi) values to DSCP in
input (output) direction
• A combination of above two types of table maps
Similar mappings are available on the 512 entry CoS marking table.
Configuring the Policy-Map Marking Action
This section describes how to establish unconditional marking action for network traffic.
Prerequisites
Perform the following:
• Create a class map (ipp5) and a policy map. Refer to the “Configuring a QoS Policy” section on
page 37-28.
• Configure the marking action. Refer to the “Configuring Policy-Map Class Actions” section on
page 37-31.
Note On Catalyst 4900M, Catalyst 4948E, Supervisor Engine 6-E, and Supervisor Engine 6L-E, the
marking action command options have been extended. Refer to Table 37-6 on page 37-70 and
Table 37-7 on page 37-71.