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System Parameters Default Maximum Current Configured
igmp-snoop-mcache 512 8192 300 300
The IGMP snooping mcache contains multicast forwarding information for VLANs. To display
information in the multicast forwarding mcache, enter the show ip multicast mcache command.
device#show ip multicast mcache
Example: (S G) cnt=: cnt is number of SW processed packets
OIF: e1/22 TR(1/32,1/33), TR is trunk, e1/32 primary, e1/33 output
vlan 10, 1 caches. use 1 VIDX
1 (10.10.10.2 239.0.0.3) cnt=0
OIF: tag e2
age=2s up-time=2s change=2s vidx=8191 (ref-cnt=1)
Syntax: show ip multicast mcache
The following table describes the output of the show ip multicast mcache command.
Field Description
(source group) Source and group addresses of this data stream. (* group) means match group only; (source
group) means match both.
cnt The number of packets processed in software. Packets are switched in hardware, which increases
this number slowly.
OIF
The output interfaces. If entire vlan is displayed, this indicates that static groups apply to the
entire VLAN.
age The mcache age. The mcache will be reset to 0 if traffic continues to arrive, otherwise the mcache
will be aged out when it reaches the time defined by the ip multicast mcache-age command.
uptime The up time of this mcache in seconds.
vidx Vidx specifies output port list index. Range is from 4096 through 8191
ref-cnt The vidx is shared among mcaches having the same output interfaces. Ref-cnt indicates the
number of mcaches using this vidx.
Displaying software resource usage for VLANs
To display information about the software resources used, enter the show ip multicast resource
command.
device#show ip multicast resource
alloc in-use avail get-fail limit get-mem size init
igmp group 256 1 255 0 32000 1 16 256
igmp phy port 1024 1 1023 0 200000 1 22 1024
.... entries deleted ...
snoop mcache entry 128 2 126 0 8192 3 56 128
total pool memory 109056 bytes
has total 2 forwarding hash
VIDX sharing hash : size=2 anchor=997 2nd-hash=no fast-trav=no
Available vidx: 4060. IGMP/MLD use 2
Syntax: show ip multicast resource
The following table describes the output displayed by the show ip multicast resource command.
Displaying software resource usage for VLANs
FastIron Ethernet Switch IP Multicast Configuration Guide 29
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