Reference Guide

The default is 15000.
NOTE: The IN-L3-McastFib CAM partition is used to store multicast routes and is a separate hardware limit that exists per
port-pipe. Any software-configured limit may supersede 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 the ip multicast-limit command sets
is reached.
Preventing 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.
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 the following example), because IGMPv2 hosts do not know in advance who the
source is for the group in which they are interested.
To apply the access list, use the following command.
● Apply the access list.
INTERFACE mode
ip igmp access-group access-list-name
Dell Networking OS Behavior: Do not enter the ip igmp access-group command before creating the access-list. If you
do, after entering your first deny rule, the system 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 ip igmp access-group command
before creating the access-list, prevent the system from clearing the routing table by entering a permit any rule with high
sequence number before you enter any other rules.
In the following example, virtual local area network (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
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