C
HAPTER
17
| Multicast Filtering
Layer 2 IGMP (Snooping and Query for IPv4)
– 622 –
Figure 363: Dropping IGMP Query or Multicast Data Packets
DISPLAYING
MULTICAST GROUPS
DISCOVERED BY
IGMP SNOOPING
Use the Multicast > IGMP Snooping > Forwarding Entry page to display the
forwarding entries learned through IGMP Snooping.
CLI REFERENCES
â—† "show ip igmp snooping group" on page 1210
â—† "clear ip igmp snooping groups dynamic" on page 1208
COMMAND USAGE
To display information about multicast groups, IGMP Snooping must first
be enabled on the switch (see page 608).
PARAMETERS
These parameters are displayed:
◆ VLAN – An interface on the switch that is forwarding traffic to
downstream ports for the specified multicast group address.
◆ Group Address – IP multicast group address with subscribers directly
attached or downstream from the switch, or a static multicast group
assigned to this interface.
◆ Interface – A downstream port or trunk that is receiving traffic for the
specified multicast group. This field may include both dynamically and
statically configured multicast router ports.
◆ Up Time – Time that this multicast group has been known.
◆ Expire – Time until this entry expires.
◆ Count – The number of times this address has been learned by IGMP
snooping.
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