Rockwell Automation 1783-WAPxxx Stratix 5100 Wireless Access Point User Manual - Manual (Page 471)

Rockwell Automation Publication 1783-UM006A-EN-P - May 2014 471
Configuring QoS Chapter 16
IGMP Snooping
When Internet Group Membership Protocol (IGMP) snooping is enabled on a
switch and a client roams from one access point to another, the clients’ multicast
session is dropped. When the access points’ IGMP snooping helper is enabled,
the access point sends a general query to the wireless LAN, prompting the client
to send in an IGMP membership report. When the network infrastructure
receives the host’s IGMP membership report, it makes sure that the delivery of
that host’s multicast data stream.
The IGMP snooping helper is enabled by default. To disable it, browse to the
QoS Policies - Advanced page, check Disable, and click Apply.
AVVID Priority Mapping
AVVID priority mapping maps Ethernet packets tagged as class of service 5 to
class of service 6. This feature enables the access point to apply the correct
priority to voice packets for compatibility with Cisco AVVID networks.
AVVID priority mapping is enabled by default. To disable it, browse to the QoS
Policies - Advanced page, select No for Map Ethernet Packets with CoS 5 to CoS
6, and click Apply.
WiFi Multimedia (WMM)
By using the Admission Control check boxes, you can enable WMM on the
access point’s radio interface. When you enable admission control, clients
associated to the access point must complete the WMM admission control
procedure before they can use that access category.
Rate Limiting
Rate limiting provides control over the data traffic transmitted or received on an
interface.The Class-Based Policing feature performs the following functions:
• Limits the input or output transmission rate of a class of traffic based on
user-defined criteria.
• Marks packets by setting the IP precedence value, IP differentiated services
code point (DSCP) value and Quality of Service (QoS) group.
IMPORTANT If there is no multicast router for processing IGMP query and response from the
host, it is mandatory that no igmp snooping be configured on the access point.
when IGMP snooping is enabled, all multicast group traffic must send IGMP
query and response packets. If IGMP query or response packets are not
detected, all multicast traffic for the group is dropped.