Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
set precedence
set precedence
To set the precedence value in the packet header, use the set precedence command in policy-map class
configuration mode. To remove the precedence value, use the no form of this command.
set precedence {precedence-value | from-field [table table-map-name]}
no set precedence {precedence-value | from-field [table table-map-name]}
Syntax Description
Command Default Disabled
Command Modes Policy-map class configuration mode
Command History
Usage Guidelines
Command Compatibility
The set precedence command cannot be used with the set dscp command to mark the same packet. The
two values, DSCP and precedence, are mutually exclusive. A packet can be one value or the other, but
not both.
precedence-value A number from 0 to 7 that sets the precedence bit in the packet header.
from-field Specific packet-marking category to be used to set the precedence value of
the packet. If you are using a table map for mapping and converting
packet-marking values, this argument value establishes the “map from”
packet-marking category. Packet-marking category keywords are as follows:
• cos
• qos-group
• dscp
• precedence
table (Optional) Indicates that the values set in a specified table map will be used
to set the precedence value.
table-map-name (Optional) Name of the table map used to specify a precedence value based
on the class of service (CoS) value. The name can be a maximum of 64
alphanumeric characters.
Release Modification
12.2(8a)EW Support for this command was introduced on the Catalyst 4500 series switch.
12.2(40)SG Added support for from-field on Supervisor Engine 6-E and Catalyst
4900M.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E