Comtech EF Data CMR-8500 Manual - Manual (Page 83)

CMR-8500 DVB IP ENCAPSULATOR Revision 2
Appendix B. IP Routing Support MN-CMR8500
B.5 80,000 Routes
The CMR-8500 is capable of providing up to 80,000 unique IP routes. Each IP route can be configured as
Unicast or Multicast. Additional routes may be supported by using the Multicast Zones feature described
in the next section.
Routes can be assigned to PIDs in the range 0x0010 to 0x1FFE (this excludes the reserved PIDs as
defined in ISO 13818-1).
B.6 Multicast Zones
The Multicast Zones feature allows the user to more efficiently configure the Encapsulator when
supporting multicasting. Using the IP subnetting techniques of Unicast routing, Multicast Zones allows a
single IP address to be specified on a route and a subnet mask is assigned to the route. The CMR-8500
uses Classless Inter-Domain Routing (CIDR) notation in which a ‘slash’ followed by a decimal number is
used to represent the number of bits for the mask; e.g. /32 is 255.255.255.255 and /24 is 255.255.255.0.
The subnet mask defines how many multicast IP addresses are allowed to be mapped to a single route.
Care must be taken when using the multicast zone feature since IP traffic present within the multicast
zone will be routed over the network. An example of multicast zone is as follows:
• Multicast Route = 239.0.10.1
• Multicast Zone Mask = 255.255.255.252
•
Multicast groups mapped to the 239.0.10.1 route:
• 239.0.10.0
• 239.0.10.1
• 239.0.10.2
• 239.0.10.3
B–5