Specifications

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Cisco Aironet 1200 Series Access Point Installation and Configuration Guide
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Chapter 13 Configuring QoS
QoS Configuration Examples
Disabling IGMP Snooping Helper
When Internet Group Membership Protocol (IGMP) snooping is enabled on a switch and a client roams
from one access point to another, the client’s multicast session is dropped. When the access point’s
IGMP snooping helper is enabled, the access point sends a general IGMP query to the network
infrastructure on behalf of the client every time the client associates or reassociates to the access point.
By doing so, the multicast stream is maintained for the client as it roams.
The IGMP snooping helper is enabled by default. To disable it, browse to the QoS Policies - Advanced
page, select Disable, and click Apply. Figure 13-3 shows the QoS Policies - Advanced page.
QoS Configuration Examples
These sections describe two common uses for QoS:
• Giving Priority to Voice Traffic, page 13-10
• Giving Priority to Video Traffic, page 13-12
Giving Priority to Voice Traffic
This section demonstrates how you can apply a QoS policy to your wireless network’s voice VLAN to
give priority to wireless phone traffic.
In this example, the network administrator creates a policy named voice_policy that applies voice class
of service to traffic from Spectralink phones (protocol 119 packets). The user applies the voice_policy
to the incoming and outgoing radio ports and to the outgoing Ethernet port for VLAN 77. Figure 13-5
shows the administrator’s QoS Policies page.