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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter29 Configuring Multicast Routing
Customizing Multicast Routing
The Protocol pane displays Yes if IGMP is enabled on the interface, or No if IGMP is disabled on the
interface.
Configuring IGMP Group Membership
You can configure the ASA to be a member of a multicast group. Configuring the ASA to join a multicast
group causes upstream routers to maintain multicast routing table information for that group and keep
the paths for that group active.
Note If you want to forward multicast packets for a specific group to an interface without the ASA accepting
those packets as part of the group, see the “Configuring a Statically Joined IGMP Group” section on
page 29-7.
To have the ASA join a multicast group, perform the following steps:
Step1 In the main ASDM window, choose Configuration > Device Setup > Routing > Multicast > IGMP >
Join Group.
The Join Group pane appears.
Step2 Click Add or Edit.
The Add IGMP Join Group dialog box allows you to configure an interface to be a member of a multicast
group. The Edit IGMP Join Group dialog box allows you to change existing membership information.
Step3 In the Interface Name field, choose the interface name from the drop-down list. If you are editing an
existing entry, you cannot change this value.
Step4 In the Multicast Group Address field, enter the address of a multicast group to which the interface
belongs. Valid group addresses range from 224.0.0.0 to 239.255.255.255.
Step5 Click OK.
Configuring a Statically Joined IGMP Group
Sometimes a group member cannot report its membership in the group because of some configuration,
or there may be no members of a group on the network segment. However, you still want multicast traffic
for that group to be sent to that network segment. You can have multicast traffic for that group sent to
the segment by configuring a statically joined IGMP group.
In the main ASDM window, choose Configuration > Routing > Multicast > IGMP > Static Group to
configure the ASA to be a statically connected member of a group. With this method, the ASA does not
accept the packets itself, but only forwards them. Therefore, this method allows fast switching. The
outgoing interface appears in the IGMP cache, but this interface is not a member of the multicast group.
To configure a statically joined multicast group on an interface, perform the following steps:
Step1 In the main ASDM window, choose Configuration > Device Setup > Routing > Multicast > IGMP >
Static Group.
The Static Group pane appears.