Brocade Mobility Access Point System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 134)

124 Brocade Mobility Access Point System Reference Guide
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Set the following for IGMP Querier configuration:
4. Select the OK button located at the bottom right of the screen to save the changes. Select
Reset to revert to the last saved configuration.
Quality of Service (QoS)
Profile Network Configuration
The uses different Quality of Service (QoS) screens to define WLAN and device radio QoS
configurations. The System Profiles > Network > QoS facility is separate from WLAN and radio QoS
configurations, and is used to configure the priority of the different DSCP packet types.
QoS values are required to provide priority of service to some packets over others. For example,
VoIP packets get higher priority than data packets to provide a better quality of service for high
priority voice traffic.
The profile QoS screen maps the 6-bit Differentiated Service Code Point (DSCP) code points to the
older 3-bit IP Precedent field located in the Type of Service byte of an IP header. DSCP is a protocol
for specifying and controlling network traffic by class so that certain traffic types get precedence.
DSCP specifies a specific per-hop behavior applied to a packet.
To define an QoS configuration for DSCP mappings:
1. Select the Configuration tab from the Web UI.
2. Select Devices.
3. Select System Profile from the options on left-hand side of the UI.
4. Expand the Network menu and select Quality of Service (QoS).
Enable IGMP Querier Select this option to enable IGMP querier. IGMP snoop querier is used to keep host memberships
alive. It is primarily used in a network where there is a multicast streaming server and hosts
subscribed to the server and no IGMP querier present. The controller can perform the IGMP querier
role. An IGMP querier sends out periodic IGMP query packets. Interested hosts reply with an IGMP
report packet. IGMP snooping is only conducted on wireless radios. IGMP multicast packets are
flooded on wired ports. IGMP multicast packet are not flooded on the wired port. IGMP
membership is also learnt on it and only if present, then forwarded on that port. An AP71xx model
access point can also be an IGMP querier.
IGMP Version Use the spinner control to set the IGMP version compatibility to IGMP version 1, 2 or 3. The default
IGMP version is 3.
IGMP Query Interval Sets the IGMP query interval. This parameter is used only when the querier functionality is
enabled. Define an interval value in Seconds (1-18000 seconds), Minutes (1-300 minutes) or
Hours (1-5 hours) up to maximum of 5 hours. The default value is 60 seconds.
IGMP Robustness Variable Sets the IGMP robustness variable. The robustness variable is a way of indicating how susceptible
the subnet is to lost packets. IGMP can recover from robustness variable minus 1 lost IGMP
packets. Define a robustness variable from 1 - 7. The default robustness value is 2.
Maximum Response Time Specify the maximum time (from 1 - 25 seconds) before sending a responding report. When no
reports are received from a radio, radio information is removed from the IGMP snooping table. The
access point only forwards multicast packets to radios present in the snooping table. For IGMP
reports from wired ports, the controller forwards these reports to the multicast router ports. The
default setting is 10 seconds.
Other Querier Time Expiry Specify an interval in either Seconds (60 - 300) or Minutes (1 - 5) to set a timeout interval for other
querier resources. The default setting is 1 minute.