Configuring Igmp Filtering - Cisco 4500M Software Manual

Configuring IGMP Filtering

This example shows how to display IGMP snooping information on VLAN 5:
Switch#show ip igmp snooping vlan 5
Global IGMP Snooping configuration:
-----------------------------------
IGMP snooping
IGMPv3 snooping support
Report suppression
TCN solicit query
TCN flood query count
Vlan 5:
--------
IGMP snooping
Immediate leave
Explicit Host Tracking
Multicast router learning mode :pim-dvmrp
CGMP interoperability mode
Configuring IGMP Filtering
This section includes the following subsections:
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•
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Note The IGMP filtering feature works for IGMPv1 and IGMPv2 only.
In some environments, for example metropolitan or multiple-dwelling unit (MDU) installations, an
administrator might want to control the multicast groups to which a user on a switch port can belong.
This allows the administrator to control the distribution of multicast services, such as IP/TV, based on
some type of subscription or service plan.
With the IGMP filtering feature, an administrator can exert this type of control. With this feature, you
can filter multicast joins on a per-port basis by configuring IP multicast profiles and associating them
with individual switch ports. An IGMP profile can contain one or more multicast groups and specifies
whether access to the group is permitted or denied. If an IGMP profile denying access to a multicast
group is applied to a switch port, the IGMP join report requesting the stream of IP multicast traffic is
dropped, and the port is not allowed to receive IP multicast traffic from that group. If the filtering action
permits access to the multicast group, the IGMP report from the port is forwarded for normal processing.
IGMP filtering controls only IGMP membership join reports and has no relationship to the function that
directs the forwarding of IP multicast traffic.
You can also set the maximum number of IGMP groups that a Layer 2 interface can join with the
ip igmp max-groups <n> command.
Software Configuration Guide—Release 12.2(25)EW
18-16
:Enabled
:Full
:Enabled
:Disabled
:2
Default IGMP Filtering Configuration, page 18-17
Configuring IGMP Profiles, page 18-17
Applying IGMP Profiles, page 18-18
Setting the Maximum Number of IGMP Groups, page 18-19
Chapter 18
:Enabled
:Disabled
:Disabled
:IGMP_ONLY
Configuring IGMP Snooping and Filtering
OL-6696-01