UMN:CLI User Manual
V5808
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port may also contain multiple group records. Each group record has one of the fol-
lowing information:
– Current-state: This indicates the current filter mode including/excluding the speci-
fied multicast address.
– Filter-mode-change: This indicates a change from the current filter mode to the
other mode.
– Source-list-change: This indicates a change allowing/blocking a list of the multi-
cast sources specified in the record.
IGMPv3 Operation
Basically, IGMPv3 has the same join/leave (allow/block in the IGMPv3 terminology) and
query-response mechanism as IGMPv2’s. Due to the major revision of the membership
report, however, leave group messages are not used for the explicit leave process any
longer. In IGMPv3 concept, membership reports with state-change records are used to
allow or block multicast sources, and those with current-state records are used to
respond to membership queries. Membership report suppression feature has been
removed for multicast routers to keep track of membership state per host.
9.1.4 Displaying IGMP Information
To display current IGMP groups and relevant information, use the following command.
show ip igmp groups [detail]
Shows the multicast groups with receivers directly
connected to the router and learned through IGMP.
A.B.C.D: IGMP group address
INTERFACE: interface name
show ip igmp groups A.B.C.D
[detail]
show ip igmp groups
INTERFACE [detail]
show ip igmp groups
INTERFACE A.B.C.D [detail]
show ip igmp groups
[INTERFACE] summary
Shows multicast-related information on an interface.
show ip igmp interface
INTERFACE
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