Configuration Guide User guide

FastIron Configuration Guide 1507
53-1002494-02
Displaying IGMP snooping information
Displaying IGMP snooping mcache information
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.
Syntax: show ip multicast mcache
The following table describes the output of the show ip multicast mcache command.
Displaying PIM sparse snooping information
PIM sparse mode snooping allows a device to listen for join or prune messages exchanged between
PIM routers, which helps reduce unwanted traffic. To display PIM snooping information, enter the
show ip multicast pimsm-snooping 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 minutes.
vidx Vidx specifies output port list index. Range is from 4096 to 8191
ref-cnt The vidx is shared among mcaches having the same output interfaces. Ref-cnt indicates the
number of mcaches using this vidx.
Brocade# show ip multicast mcache
Example: (S G) cnt=: cnt: SW proc. count
OIF: 0/1/22 TR(0/1/32,0/1/33), TR is trunk, 0/1/32 primary, 0/1/33 output
vlan 1, 1 caches. use 1 VIDX
1 (1.2.10.102 225.1.1.1) cnt=46
OIF: 0/1/4
age=0m up-time=45m vidx=4130 (ref-cnt=1)
vlan 70, 1 caches. use 1 VIDX
1 (* 226.1.2.3) cnt=69
OIF: 0/1/14
age=0m up-time=59m vidx=4129 (ref-cnt=1)
Brocade# show ip multicast pimsm-snooping
vlan 1, has 1 caches.
1 (1.2.10.102 225.1.1.1) has 0 pim join ports out of 1 OIF
vlan 70, has 1 caches.
1 (* 226.1.2.3) has 2 pim join ports out of 2 OIF
0/1/14 (age=60), 0/1/13 (age=60),
0/1/14 has 1 src: 1.1.30.99(60)
0/1/13 has 1 src: 1.1.30.99(60)