3com WX2200 3CRWX220095A User Manual

MAP forwarding prioritization occurs automatically for Wi-Fi Multimedia 
(WMM) traffic. You do not need to configure ACLs to provide WMM 
prioritization. For non-WMM devices, you can provide MAP forwarding 
prioritization by configuring ACLs. 

If you disable WMM, MAP forwarding prioritization is optimized for 
SpectraLink Voice Priority (SVP) instead of WMM, and the MAP does not 
tag packets it sends to the WX. Otherwise, the classification and tagging 
described in “Displaying QoS Information” on page 345 remain in effect. 

If you plan to use SVP or another non-WMM type of prioritization, you 
must configure ACLs to tag the packets. (See “Enabling Prioritization for 
Legacy Voice over IP” on page 401.)

Optionally, for WMM or non-WMM traffic, you can use ACLs to change 
the priority of traffic sent to a MAP or VLAN. (To change CoS for WMM or 
non-WMM traffic, see “Using ACLs to Change CoS” on page 399.) 

With the following command, you can use security ACLs to set Internet 
Control Message Protocol (ICMP) parameters for the ping command:

set security acl ip acl-name {permit [cos cos] | deny} 
icmp {source-ip-addr mask | any} {destination-ip-addr mask| 
any} [type icmp-type] [code icmp-code] [precedence 
precedence] [tos tos] | [dscp codepoint]] [before 
editbuffer-index | modify editbuffer-index] [hits]

An ICMP ACL can filter packets by source and destination IP address, TOS 
level, precedence, ICMP type, and ICMP code. For example, the following 
command permits all ICMP packets coming from 192.168.1.3 and going 
to 192.168.1.4 that also meet the following conditions:

„

ICMP type is 11 (Time Exceeded).

„

ICMP code is 0 (Time to Live Exceeded).

Table 31   Class-of-Service (CoS) Packet Handling

Background

1 or 2

Best effort

0 or 3

Video

4 or 5 

Voice

6 or 7