Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 643)

IGMP snooping scalability
Here are the scalability limits of IGMP snooping feature in various modes of switch operation for
Network OS 4.1.0. The table explains the various metrics involved in describing the scalability limits.
IGMP Metric Description
Maximum number of IGMP
groups supported This metric is based on the available hardware resources, such as multicast
group ID (MGID), configuration replay, and Ethernet Name Server (eNS)
distribution bandwidth.
Maximum number of VLANs
supported with IGMP snooping
configuration This metric is limited by the general-query packet-generation capacity of IGMP
software processes running on the switch, as well as by eNS distribution
bandwidth.
Maximum IGMP packet-
processing rate per switch The scalability number described by this metric suggests the upper limit on the
number of packets that can be processed by IGMP software processes running
on the switch. If the packets are incoming from multiple ports/VLANs, the same
processing bandwidth is shared.
Maximum IGMP packet-
processing rate per Brocade
VCS Fabric cluster This metric specifies the upper limit on the maximum rate of IGMP packets
incoming to a logical Brocade VCS Fabric switch. It is limited by the eNS
distribution bandwidth and the number of nodes in the Brocade VCS Fabric
cluster.
IGMP snooping in standalone mode
In standalone mode, the VDX switch functions as an isolated device, possibly connected as a top-of-
rack (TOR) switch. The table below provides details about the metric levels.
IGMP snooping: standalone mode metrics TABLE 93
Metric Limit Comments
Maximum number of IGMP groups supported 2000 Join requests are sent on four ports of
the same switch.
Maximum number of VLANs supported with IGMP
configuration 128
Maximum IGMP packet-processing rate per switch 512 packets/sec
IGMP snooping in Brocade VCS Fabric cluster mode
When supporting a flat Layer 2 network in a data center, VDX switches can be connected in any order
to form a cluster. The number of nodes involved in a cluster ranges from four nodes to 24 nodes.
Metrics are detailed in the following tables.
IGMP snooping: four-node cluster metrics TABLE 94
Metric Limit Comments
Maximum number of IGMP groups supported 2000 Join requests are sent on four ports
of the same switch.
IGMP snooping scalability
Network OS Administrator’s Guide 643
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