Ethernet Interface Operation Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
7–22
Address / Address Range or Rule
Comtech internal modem use
Comtech internal modem use
224.0.0.0 – 239.255.255.255
RFC 5771 multicast addresses
240.0.0.0 – 255.255.255.255
RFC 6890 reserves IP address (future)
aaa >= 128 and <= 191 subnet_mask < 16
aaa >= 192 and <= 224 subnet_mask < 24
RFC 791 classful networking addresses
Network bits cannot be all 0s or all 1s – i.e., a subnet
with a mask of /24 cannot have an IP address that
Reserved for network address and broadcast address
Click [Submit] to save.
• Mgmt MAC Address – This read-only field displays the modem management port (P0 |
MGMT) MAC address.
• Router / Bridge Working Mode – Managed Switch Working Mode indicates that the User
Data Ports (P1 through P4) are in a Managed Switch (Layer 2) mode. At present, Working
Mode is limited only to “Point to Point” mode. These drop-down lists are therefore non-
functional. DATA Ports P1 through P4 cannot be routed; however, if you require a routed
network, you can pass user traffic through the P0 | MGMT port and route the traffic.
Routed traffic will run at a lower PPS rate than bridged traffic. User traffic
passing through the P0 | MGMT port cannot exceed 105,000 PPS simplex or
150,000 PPS duplex compared to bridged traffic which can run at >190,000 PPS
simplex or >350,000 PPS duplex.
Port Configuration
Use this section to configure the Packet Processor’s data traffic and management ports. Click
[Submit] to save. Note the following:
Port
This column lists the Packet Processor’s four available Ethernet data traffic ports (P1 |
DATA through P4 | DATA), and the P0 | MGMT port that is reserved for M&C (Monitor and
Control) purposes.
Speed
Use the drop-down list to select the port speed/duplex communications as Auto, 100 Full,
100 Half, 10 Full, or 10 Half.
You are strongly advised to set all port speeds to Auto whenever
possible.
MAC Learning
Use the drop-down list to select MAC Learning as Disabled or Enabled.
Chapter 6. FRONT PANEL OPERATION Sect. 6.2.2.4.2.1 MAC Learning
Operational States
Actual Negotiated
Port Speed
This read-only column displays the port’s current operating speed when you set the speed
to Auto. “Link Down” indicates that the modem detects no valid Ethernet device connection
1) All ports are auto-crossover/auto-sensing.
2) It is critical that your port settings match the settings of the connected
equipment. A mismatch of port settings can cause random packet loss and
connection drops.
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