Enabling Prioritization for Legacy Voice over IP 401

 

The following commands perform the same CoS reassignment as the

 

commands in “Using the dscp Option” on page 400. They remap IP

 

packets from IP address 10.10.50.2 that have DSCP value 46 (equivalent

 

to precedence value 5 and ToS value 12), to have CoS value 7 when they

 

are forwarded to any 10.10.90.x address on Distributed MAP 4:

 

WX1200# set security acl ip acl2 permit cos 7 ip 10.10.50.2

 

0.0.0.0 10.10.90.0 0.0.0.255 precedence 5 tos 12

 

success: change accepted.

 

WX1200# set security acl ip acl2 permit cos 7 ip 10.10.50.2

 

0.0.0.0 10.10.90.0 0.0.0.255 precedence 5 tos 13

 

success: change accepted.

 

WX1200# set security acl ip acl2 permit any

 

success: change accepted.

 

WX1200# commit security acl acl2

 

success: change accepted.

 

WX1200# set security acl map acl2 ap 4 out

 

success: change accepted.

 

The ACL contains two ACEs. The first ACE matches on precedence 5 and

 

ToS 12. The second ACE matches on precedence 5 and ToS 13. The IP

 

precedence and ToS fields use 7 bits, while the DSCP field uses only 6

 

bits. Following the DSCP field is a 2-bit ECN field that can be set by other

 

devices based on network congestion. The second ACE is required to

 

ensure that the ACL matches regardless of the value of the seventh bit.

 

You cannot use the dscp option along with the precedence and tos

 

options in the same ACE. The CLI rejects an ACE that has this

 

combination of options.

 

 

Enabling

MSS supports Wi-Fi Multimedia (WMM). WMM support is enabled by

Prioritization for

default and is automatically used for priority traffic between

Legacy Voice over

WMM-capable devices.

IP

MSS also can provide prioritization for non-WMM VoIP devices. However,

 

 

to provide priority service to non-WMM VoIP traffic, you must configure

 

static CoS or configure an ACL to set the CoS for the traffic. The MAP

 

maps the CoS value assigned by static CoS or the ACL to a forwarding

 

queue. The examples in this section show how to configure CoS using

 

ACLs. To use static CoS instead, see “Configuring Static CoS” on

 

page 343.

Page 400 Page 402
Page 401
Image 401
3Com WX4400 3CRWX440095A Prioritization for, Legacy Voice over, Are forwarded to any 10.10.90.x address on Distributed MAP
Page 400 Page 402

WX1200 3CRWX120695A, WX4400 3CRWX440095A, WXR100 3CRWXR10095A, WX2200 3CRWX220095A specifications

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