Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 159)

Brocade Mobility RFS Controller System Reference Guide 147
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6. Set or override the following IGMP Querier parameters for the profile’s bridge VLAN
configuration:
7. Select the OK button to save the changes and overrides to the IGMP Snooping tab. Select
Reset to revert to the last saved configuration.
Overriding a Profile’s Quality of Service (QoS) Configuration
Overriding a Profile’s Network Configuration
The controller or service platform use different Quality of Service (QoS) screens to define WLAN
and device radio QoS configurations for profiles.
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 that is applied to a packet. This QoS assignment can be
overridden as needed, but removes the device configuration from the profile that may be shared
with other similar device models.
To define an QoS configuration for DSCP mappings:
1. Select Devices from the Configuration tab.
Enable IGMP Querier Select this option to enable IGMP querier. IGMP snoop querier is used to keep host
memberships alive. It’s primarily used in a network where there’s a multicast
streaming server and hosts subscribed to the server and no IGMP querier present. 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 it is
forwarded on that port.
IGMP Version Use the spinner control to set the IGMP version compatibility to either version 1, 2 or
3. IGMPv1 is defined by RFC 1112, IGMPv2 is defined by RFC 2236 and IGMPv3
defined by RFC 4604 which defines both IGMPv3 and MLDv2. IGMPv2 improves over
IGMPv1 by adding the ability for a host to signal desire to leave a multicast group.
IGMPv3 improves over IGMPv2 by adding the ability to listen to multicast traffic
originating from a set of source IP addresses exclusively. The default setting is 3.
IGMP Query Interval Set the interval IGMP queries are made. Options include Seconds
(1 - 18,000), Minutes (1 - 300) and Hours (1 - 5). The default setting is one minute.
IGMP Robustness
Variable IGMP utilizes a robustness value used by the sender of a query. Update the
robustness variable to match the most recently received query unless the value is
zero.
Maximum Response
Time Specify the maximum interval (from 1 - 25 seconds) before sending a responding
report. When no reports are received from a radio, radio information is removed from
the snooping table. The controller or service platform only forwards multicast packets
to radios present in the snooping table. For IGMP reports from wired ports, the
controller or service platform forwards these reports to the multicast router ports.
The default setting is 10 seconds.
Other Querier Timer
Expiry Specify an interval in either Seconds (60 - 300) or Minutes (1 - 5) used as a timeout
interval for other querier resource connections. The default setting is 1 minute.