Cisco Catalyst 4500 Series, Software Configuration Manual

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28-30
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 28 Configuring IGMP Snooping and Filtering, and MVR
Configuring IGMP Filtering
Switch# show mvr interface fastEthernet 2/2 members
MVR Group IP VLAN Membership Status
----------------------------------------------------
225.1.1.1 vlan 200 DYNAMIC ACTIVE/UP
Switch# show mvr interface fastEthernet 2/2 members vlan 200
MVR Group IP VLAN Membership Status
----------------------------------------------------
225.1.1.1 vlan 200 DYNAMIC ACTIVE/UP
Switch# show mvr members
MVR Group IP Status Members VLAN Membership
---------------------------------------------------------------------
225.1.1.1 ACTIVE/UP Fa2/2 200 Dynamic
Switch# show mvr members 225.1.1.1
MVR Group IP Status Members VLAN Membership
---------------------------------------------------------------------
225.1.1.1 ACTIVE/UP Fa2/2 200 Dynamic
Configuring IGMP Filtering
This section includes the following subsections:
• Default IGMP Filtering Configuration, page 28-30
•
Configuring IGMP Profiles, page 28-31
• Applying IGMP Profiles, page 28-32
•
Setting the Maximum Number of IGMP Groups, page 28-33
Note
The IGMP filtering feature works for IGMPv1 and IGMPv2 only.
In some environments (like 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 IGMP filtering, an administrator can apply 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.
Default IGMP Filtering Configuration
Table 28-4 shows the default IGMP filtering configuration.