Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 447
Prevent a Host from Joining a Group, FTOS Behavior
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Note: The IN-L3-McastFib CAM partition is used to store multicast routes and is a separate hardware limit that is exists per port-pipe. Any software-configured limit might be superseded by this hardware space limitation. The opposite is also true, the CAM partition might not be exhausted at the time the system-wide route limit set by the ip multicast-limit is reached. Prevent a Host from Joining a Group You can prevent a host from joining a particular group by blocking specific IGMP reports. Create an extended access list containing the permissible source-group pairs. Use the command ip igmp access-group access-list-name from INTERFACE mode to apply the access list. Note: For rules in IGMP access lists, source is the multicast source, not the source of the IGMP packet. For IGMPv2, use the keyword any for source (as shown in Figure 23-2), since IGMPv2 hosts do not know in advance who the source is for the group in which they are interested. FTOS Behavior: Do not enter the command ip igmp access-group before creating the access-list. If you do, upon entering your first deny rule, FTOS clears multicast routing table and re-learns all groups, even those not covered by the rules in the access-list, because there is an implicit deny all rule at the end of all access-lists. Therefore, configuring an IGMP join request filter in this order might result in data loss. If you must enter the command ip igmp access-group before creating the access-list, prevent FTOS from clearing the routing table by entering a permit any rule with high sequence number before you enter any other rules. In Figure 23-2, VLAN 400 is configured with an access list to permit only IGMP reports for group 239.0.0.1. Though Receiver 2 sends a membership report for groups 239.0.0.1 and 239.0.0.2, a multicast routing table entry is created only for group 239.0.0.1. VLAN 300 has no access list limiting Receiver 1, so both IGMP reports are accepted, and two corresponding entries are created in the routing table. Multicast Features | 447
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