Comtech EF Data CMR-6000 Manual - Manual (Page 110)

Digicast Media Router S2 Receiver CMR-6000 Revision 1
IP Routing Support
B–2
B.2 IP Configuration
Both Unicast and Multicast IP datagrams are encapsulated per the Multiprotocol Encapsulation
MPE specification. Routing of datagrams is accomplished by configuration of PIDs in the
CMR-6000, as described in the following sections.
B.2.1 Unicast Routing
Unicast routing provides point-to-point delivery of IP datagrams. Routes for Unicast IP packets
are configured according to the following:
• IP Addresses, which fall into three classes:
ƒ
A (0.0.0.0 to 127.255.255.255)
ƒ B (128.0.0.0 to 191.255.255.255)
ƒ C (192.0.0.0 to 223.255.255.255)
• Medium Access Control (MAC) Addresses, which identifies the destination device (next-
hop) to which the packets are sent. The least-significant bit of the first byte of the six-byte
MAC address is a ‘0’. For example, 0x00 11 22 33 44 55 is a Unicast address.
Unicast is supported by the CMR-6000 as it would be in any routed network. Packets received by
the CMR-6000 are routed to the Ethernet if they meet the subnet criteria or the CMR-6000 is
configured to route non-local packets to a default gateway.
The CMR-6000 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 above, part of the route configuration is a MAC address that is assigned for delivery of
the packet when it is encapsulated into MPE. The MAC address typically identifies the remote
receiver (physical device), e.g. satellite terminal, DTV terminal, or cable receiver.