Cisco 2950G 24 Software Configuration Guide - Page 410

Configuring IGMP Filtering Chapter 17 Configuring IGMP Snooping and MVR This is an example of output from the show mvr interface privileged EXEC command for a specified interface: Switch# show mvr interface fastethernet0/2 224.0.1.1 DYNAMIC ACTIVE This is an example of output from the show mvr interface privileged EXEC command when the members keyword is included: Switch# show mvr interface fastethernet0/2 members 224.0.1.1 DYNAMIC ACTIVE This is an example of output from the show mvr members privileged EXEC command: Switch# show mvr members MVR Group IP Status 224.0.1.1 ACTIVE 224.0.1.2 ACTIVE 224.0.1.3 ACTIVE 224.0.1.4 ACTIVE 224.0.1.5 ACTIVE Members ------Fa0/1(s), Fa0/2(d) Fa0/1(s) Fa0/1(s) Fa0/1(s) Fa0/1(s) Configuring IGMP Filtering In some environments, for example metropolitan or multiple-dwelling unit (MDU) installations, an administrator might want to control the set of 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, 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 group specific query and membership reports, including join and leave reports. It does not control general IGMP queries. IGMP filtering has no relationship with the function that directs the forwarding of IP multicast traffic. The filtering feature operates in the same manner whether CGMP or MVR is used to forward the multicast traffic. You can also set the maximum number of IGMP groups that a Layer 2 interface can join. 17-20 Catalyst 2950 Desktop Switch Software Configuration Guide 78-14982-01