Cisco ASA 5505 Configuration Manual page 455

Chapter 24 Configuring Multicast Routing
To configure a static multicast route or a static multicast route for a stub area, perform the following
steps:
In the main ASDM window, choose Configuration > Device Setup > Routing > Multicast > MRoute.
Step 1
Choose Add or Edit.
Step 2
The Add or Edit Multicast Route dialog box appears.
Use the Add Multicast Route dialog box to add a new static multicast route to the adaptive security
appliance. Use the Edit Multicast Route dialog box to change an existing static multicast route
In the Source Address field enter the IP address of the multicast source. You cannot change this value
Step 3
when editing an exiting static multicast route.
Choose the network mask for the IP address of the multicast source from the from the Source Mask
Step 4
drop-down list.
In the Incoming Interface area, click on either the RPF Interface radio button to choose RPF to forward
Step 5
the route, or click the Interface Name radio button and enter the following:
•
•
Note
Step 6 In the Administrative Distance field, choose the administrative distance of the static multicast route. If
the static multicast route has the same administrative distance as the unicast route, then the static
multicast route takes precedence.
Click OK.
Step 7
Configuring IGMP Features
IP hosts use Internet Group Management Protocol, or IGMP, to report their group memberships to
directly connected multicast routers.
IGMP is used to dynamically register individual hosts in a multicast group on a particular LAN. Hosts
identify group memberships by sending IGMP messages to their local multicast router. Under IGMP,
routers listen to IGMP messages and periodically send out queries to discover which groups are active
or inactive on a particular subnet.
IGMP uses group addresses (Class D IP address) as group identifiers. Host group address can be in the
range 224.0.0.0 to 239.255.255.255. The address 224.0.0.0 is never assigned to any group. The address
224.0.0.1 is assigned to all systems on a subnet. The address 224.0.0.2 is assigned to all routers on a
subnet.
When you enable multicast routing on the adaptive security appliance, IGMP Version 2 is automatically
enabled on all interfaces.
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In the Source Interface field, choose the incoming interface for the multicast route from the
drop-down list.
In the Destination Interface field, choose the destination interface that the route is forwarded
through the selected interface form the drop-down list.
You can specify the interface, or the RPF neighbor, but not both at the same time
Cisco ASA 5500 Series Configuration Guide using ASDM
Customizing Multicast Routing
24-5