Configuring IP routing and forwarding Configure multicast routes
Digi TransPort® Routers User Guide
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Configure multicast routes
Digi TransPort routers support multicast routes, allowing them to route packets to multicast group
addresses. You can configure up to 20 different static multicast routes.
Use static multicast routes in conjunction with the IGMP parameter on the outbound interface. For
example, after configuring a static multicast route for multicast traffic via PPP 1, the IGMP parameter
in Configuration > Network > Interfaces > IGMP must be set to On.
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1. Go to Configuration > Network > IP Routing/Forwarding > Multicast Routes.
2. Configure the multicast routing table by entering the following parameters.
Multicast Address a.b.c.d
Specified with the Mask parameter below, to identify the destination multicast group address
for packets that will match this route. Therefore, if a router receives a packet with a
destination multicast group address that matches the specified Multicast Address/Mask
combination, it routes that packet through the interface specified by the Interface parameters
below.
Mask a.b.c.d
The address mask specified with the MulticastAddress parameter as described above.
Interface x,y
These two parameters in the drop-down list and adjacent text box specify the interface and
interface instance for routing packets matching the Multicast Address/Mask combination. The
options available in the drop-down list are; PPP, Ethernet, Tunnel.
Enable multicast source path checking
If enabled, the router checks the source address of any multicast packets received to
determine whether the packet has arrived from the most direct path. The router performs this
check by doing a route look-up on the source address, and comparing the lookup results with
the interface on which the packet arrived. If the interfaces are the same, the router accepts
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