Nortel Networks 2300 manual Enabling Prioritization for Legacy Voice over IP

376Configuring and Managing Security ACLs

Enabling Prioritization for Legacy Voice over IP

WSS Software supports Wi-Fi Multimedia (WMM). WMM support is enabled by default and is automatically used for priority traffic between WMM-capable devices.

WSS Software also can provide prioritization for non-WMM VoIP devices. However, to provide priority service to non-WMM VoIP traffic, you must configure an ACL to set the CoS for the traffic. The AP maps this CoS value to a forwarding queue.

•If you plan to leave WMM enabled, use an ACL to set the CoS for any type of non-WMM VoIP wireless traffic to 6 or 7.

•If you plan to disable WMM, set the CoS for SVP traffic to 6 or 7, but set the CoS for other types of non-WMM VoIP traffic to 4 or 5. When WMM is disabled, the AP forwarding queue that maps to CoS values 6 and 7 is optimized for SVP.

Note. If you are upgrading a switch running WSS Software Version 3.x to WSS Software Version 4.x, and the switch uses ACLs to map VoIP traffic to CoS 4 or 5, and you plan to leave WMM enabled, Nortel recommends that you change the ACLs to map the traffic to CoS 6 or 7.

You must map the ACL to the outbound traffic direction on an AP port, Distributed AP, or user VLAN. An ACL can set a packet’s CoS only in these cases.

You can enable legacy VoIP support on a VLAN, port group, port list, virtual port list, Distributed AP, or user wildcard. You do not need to disable WMM support.

For example, to enable VoIP support for TeleSym packets, which use UDP port 3344, for all users in VLAN corp_vlan, perform the following steps:

1Configure an ACE in ACL voip that assigns IP traffic from any IP address with source UDP port 3344, addressed to any destination address, to CoS queue 6:

23x0# set security acl ip voip permit cos 6 udp 0.0.0.0 255.255.255.255 eq 3344 0.0.0.0 255.255.255.255

2Configure another ACE to change the default action of the ACL from deny to permit. Otherwise, the ACL permits only voice traffic that matches the previous ACE and denies all other traffic.

23x0# set security acl ip voip permit 0.0.0.0 255.255.255.255

3Commit the ACL to the configuration:

23x0# commit security acl voip

4Map the ACL to the outbound traffic direction of VLAN corp_vlan:

23x0# set security acl map voip vlan corp_vlan out

320657-A