15. Routing of Multicast Traffic
The VSAT can be configured to route multicast traffic from the LAN to the return channel (to the Hub).
User privilege level 2 is required for configuring the multicast routing.
To set up static routing of a multicast group from the LAN to the satellite interface, use the CLI command
ip addroute <IP group address> <subnet mask> <ifnum>, where IP group address is
the IP multicast address that shall be routed from the Ethernet LAN to the Hub, subnet mask is the net
mask for this routing entry, and ifnum is the interface number (always set this to 3, which is for Satellite
Interface).
Example:
# ip addroute 224.0.2.2 255.255.255.255 3
The command in the example will set up a route for the multicast group with the IP address 224.0.2.2 to
the satellite interface (to the Hub). The MAC address used on the Return Link will be calculated
according to RFC 1112.
To view the defined multicast routes, use the CLI command ip show –mcast.
Example:
# ip show –mcast
IP Multicast Routing Table
RouteAddress AddressMask IfIndex
224.0.0.2 255.255.255.255 1
224.0.2.2 255.255.255.255 3
Subnetwork internal multicast groups on the LAN will show up in the multicast route table
(e.g., LAN internal multicast traffic generated by Windows Network neighborhood, etc.).
Such traffic will have the IfIndex set to 1.
To delete multicast routes, use the CLI command:
ip delroute <IP group address> <subnet mask> <ifnum>
Example:
# ip delroute 224.0.2.2 255.255.255.255 3
The above example will delete the static route of the multicast group with the IP address 224.0.2.2 from
the Ethernet LAN to the satellite interface (Hub).
Enter the CLI command save config to save the Return Link multicast configuration.
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