Dell Force10 S4810P Configuration Manual page 713

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 Any software-configured limit might be superseded by this hardware space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
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
access-list-name
Note: For rules in IGMP access lists,
For IGMPv2, use the keyword
in advance who the source is for the group in which they are interested.
FTOS Behavior: Do not enter the command
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
before creating the access-list, prevent FTOS from clearing the routing table by entering a permit any
access-group
rule with high sequence number before you enter any other rules.
In Figure 33-2, 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.
is reached.
ip multicast-limit
from INTERFACE mode to apply the access li
source
for
any
source
ip igmp access-group
st.
is the multicast source, not the source of the IGMP packet.
(as shown in Figure 33-2), since IGMPv2 hosts do not know
before creating the access-list. If you do, upon
ip igmp access-group
ip igmp
Multicast Features | 713