Comtech EF Data CMR-5910 Manual - Manual (Page 72)

Digicast Media Router Serial IP (SIP): CMR-5910 (MG-SIP) & CMR-5920 (MR-SIP) Revision A
IP Routing Support MN/MDRTRIPDC.IOM
uses the HDLC addresses to filter required IP datagrams. An MR-SIP may be
configured to filter up to 32 unique HDLC addresses.
Unicast is supported by the MG-SIP as it would be in any routed network. A route is
created and a subnet mask is assigned to the route.
The MG-SIP 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.
As stated previously, part of the route configuration is a HDLC address which identifies
the IP route in the data stream.
B.2.2 Multicast Routing
Multicast routing provides point-to-multipoint delivery of IP datagrams. Routes for
multicast IP packets are configured according to the following:
• IP Addresses, which fall into class D (224.0.0.0 to 239.255.255.255)
• HDLC Addresses, to which a specific IP destination address is mapped. This
identifies the packets in the HDLC stream for a particular route. The MR-SIP
uses the HDLC addresses to filter required IP datagrams.
B.3 64 Routes
The MG-SIP and MR-SIP are capable of providing up to 64 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 HDLC addresses in the range 0000 to FFFF.
B.4 Multicast Zones
The Multicast Zones feature allows the user to more efficiently configure the Gateway
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
assigned to the route.
The MG-SIP 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.
B-2