Comtech EF Data CME-5000 Manual - Manual (Page 77)

Digicast Micro Encapsulator (MENCAP) Revision A
IP Routing Support MN/MENCAPEDC.IOM
B.8 IP Copy
IP Copy is another technique for more efficiently mapping incoming IP packets to
Encapsulator routes by means of a defined rule associated with a given route. Typically,
IP Copy is used for Unicast traffic. The rules instruct the MENCAP 50 how to assign the
MAC addresses, used in the encapsulation process, based on the incoming IP address of
the packets. The rules appear as follows:
• IP Copy Range = 10.10.10.X
• Mask = 255.255.255.0
The rule states the last byte of the IP address “X” becomes the last byte of the destined
MAC address:
• MAC Address = 0x00 50 C2 25 00 00 – 0x00 50 C2 25 00 FF
The IP Copy rules provide automatic MAC address assignment based on the incoming IP
address. Therefore, a single route running IP Copy can support multiple remotes. In this
example, the rule will support up to 1,024 remotes on a single route.
IP Copy Example:
Incoming IP Address – 10.10.10.5 assigned MAC Address – 0x00 50 C2 25 00 05
Incoming IP Address – 10.10.10.100 assigned MAC Address – 0x00 50 C2 25 00 64
B.9 Quality of Service (QoS)
Each route defined can be configured to provide a determined bandwidth. Note that all
QoS rates are for the MPEG transport stream and are based on MPEG payloads.
Therefore, IP data rates may be slightly less due to the transport overhead of the MPEG
and MPE. Additionally, running section packing will provide more IP data throughput,
but consumes an equal amount of usage over the MPEG transport stream. The bandwidth
attributes that may be set are as follows:
• Minimum: The guaranteed amount of bandwidth the MENCAP 50 will provide
for this route. The total number of routes with guaranteed bandwidth must always
be less than the rate of the egress port.
• Maximum: The maximum amount of bandwidth a route will be allowed to have.
Once the traffic for this route exceeds this level, packets will be silently
discarded to ensure that the maximum is not exceeded
• No Setting: If neither the Guaranteed nor the Maximum values are set, the route
will be allowed to use as much bandwidth as possible and possibly attempt to
exceed the egress bandwidth, which will result in lost data. Conversely, if there is
not guaranteed bandwidth for the route, another route may utilize all available
bandwidth.
B-5