Chapter 14: Voice 261
Section 14-2
The policy uses a class to match traffic from the ACL.
c. Apply the QoS policy to the voice VLAN:
(global) interface vlan voice-vlan
(interface) service-policy input policy-name
The QoS policy can be applied to all ports carrying the voice VLAN. This is an
efficient way to use a QoS policy on one specific VLAN within a trunk.
4. Configure voice scheduling on the egress ports:
By default, all frames with CoS 5 are sent to the strict-priority queue. Frames with
CoS 3 are sent to the lowest-priority queue. The scheduling map makes sure that the
voice control frames (CoS 3) are sent to a higher-priority queue, serviced ahead of
other traffic.
Voice QoS Example
See the QoS example in section “13-2: QoS Configuration,” in Chapter 13, “Quality of
Service,” which presents a complete voice example, covering a variety of switch platforms
in a layered network design.
Further Reading
Refer to the following recommended sources for further information about the topics covered
in this chapter.
Cisco IP Telephony Design Guides
Cisco Unified Communications SRND – Network Infrastructure:
http://www.tinyurl.com/dg5gxs.
Design Zone for Unified Communications at: http://www.tinyurl.com/a4yknm.
Cisco IP Telephony Books
Davidson, et al. Voice over IP Fundamentals. Cisco Press, 1-58705-257-1.
Deel, Nelson, and Smith. Developing Cisco IP Phone Services. Cisco Press, ISBN 1-58705-
060-9.
Giralt, Paul and Addis Hallmark. Troubleshooting Cisco IP Telephony. Cisco Press, ISBN 1-
58705-075-7
IOS L3
(interface) no mls qos vlan-based
(interface) wrr-queue cos-map 2 1 3
IOS L2
(interface) wrr-queue cos-map 2 1 3
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