Cisco MWR 2941 Installation Manual download pdf (Page 434)

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR

OL-26895-01

Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR

set ip precedence (route-map)

You can set the precedence using either a number or the corresponding name. Once the IP Precedence

bits are set, other QoS services such as weighted fair queueing (WFQ) then operate on the bit settings.

The network gives priority (or some type of expedited handling) to marked traffic through the application

of WFQ at points downstream in the network. Typically, you set IP Precedence at the edge of the network

(or administrative domain); data then is queued based on the precedence. WFQ can speed up handling

for certain precedence traffic at congestion points. WRED can ensure that certain precedence traffic has

lower loss rates than other traffic during times of congestion.

Note Release 15.0(1)MR does not support WRED.

The mapping from arguments such as routine and priority to a precedence value is useful only in some

instances. That is, the use of the precedence bit is evolving. You can define the meaning of a precedence

value by enabling other features that use the value. In the case of the high-end Internet QoS available

from Cisco, IP Precedences can be used to establish classes of service that do not necessarily correspond

numerically to better or worse handling in the network.

Use the route-map (IP) global configuration command with the match and set route-map configuration

commands to define the conditions for redistributing routes from one routing protocol into another, or

for policy routing. Each route-map command has an associated list of match and set commands. The

match commands specify the match criteria—the conditions under which redistribution or policy

routing is allowed for the current route-map command. The set commands specify the set actions—the

particular redistribution or policy routing actions to perform if the criteria enforced by the match

commands are met. The no route-map command deletes the route map.

The set route-map configuration commands specify the redistribution set actions to be performed when

all of the match criteria of a route map are met.

Examples The following example sets the IP Precedence to 5 (critical) for packets that pass the route map match:

interface serial 0

ip policy route-map texas

route-map texas

match length 68 128

set ip precedence 5

Related Commands

6 internet

7 network

Table 1-11 Number and Name Values for IP Precedence

Command Description

random-detect dscp Changes the minimum and maximum packet thresholds for the DSCP

value.

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