Cisco Catalyst 4500 Series, Руководство по настройке программного обеспечения

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 44 Configuring Quality of Service
Configuring VSS QoS
Hardware Capabilities for Marking
Catalyst 4900M, Catalyst 4948E, Supervisor Engine 6-E, and Supervisor Engine 6L-E provide a 128
entry marking action (Supervisor Engine 7-E, Supervisor Engine 7L-E, and Supervisor Engine 8-E
provide a 256 entry marking action) 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 256 unique marking actions or 64
unique policer-based actions or a combinations of the two.
For each of the marking fields (COS and DSCP), the supervisor engine provides 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 setup by the user.
For example, the TOS marking table provides marking of DSCP/Precedence fields and can be used as
one of the following:
•
64 (32) different tablemaps with each one mapping 8 CoS (16 CoS and CFi) values to DSCP in input
(output) direction
•
a combination of above two types of tablemaps
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.
As a prerequisites, create a class map ( ipp5) and a policy map. (Refer to the“Configuring a Policy Map”
section on page 44-50).
Note
The marking action command options have been extended (refer to Table 44-4 on page 44-54
andTable 44-5 on page 44-55).
Configuring Tablemap-based Unconditional Marking
To configure table-map based unconditional marking, perform this task:
Command Purpose
Step 1
Switch#
configure terminal
Enters global configuration mode.
Step 2
Switch(config)# table-map name
Configures a tablemap.
Step 3
Switch(config-tablemap)# map from
from_value to to_value
Creates a map from a from_value to a to_value
Step 4
Switch(config-tablemap)# exit
Exits table-map configuration mode.
Step 5
Switch(config)# policy-map name Enters policy-map configuration mode.
Step 6
Switch(config-p)# class name
Selects the class for QoS actions.
Step 7
Switch(config-p-c)# set cos | dscp |
prec cos | dscp | prec [ table name ]
Selects the marking action based on an implicit or explicit
table-map.
Step 8
Switch(config-p-c)# end
Exits configuration mode.