Comtech EF Data CRS-180 - Manual (Page 28)

CRS-180 70/140 MHz IF 1:1 Redundancy Switch MN/CRS180.IOM
Introduction Revision 11
1–8
Note the following:
1) The Managed Switch Mode method of redundancy is intended to be equivalent to pulling
the Ethernet cable from one port and putting it into a different port on the same switch.
2) For CDM-625/A modems: You may configure one of the CDM-625/A’s four available 10/100
Ethernet ports for M&C Ethernet. As configured in Dedicated Management Port Mode,
when the modem is Offline the M&C-designated port remains functional and available for
operation, while the three remaining ports are unavailable. Otherwise, if none of the 10/100
Ethernet ports are reserved for M&C operation; all four ports become unavailable when the
modem is Offline.
This configuration must be enabled on both modems.
See the CDM-625 or CDM-625A Advanced Satellite Modem Installation and Operation
Manual for instructions to configure one of the four 10/100 Ethernet ports for each modem
for remote Ethernet M&C.
Dedicated Management Port Mode is not configurable for use when the
optional IP Packet Processor is installed and enabled. With the IP Packet
Processor enabled, as a means to avoid Ethernet Networking Loops, only one of
the CDM-625/A’s four 10/100 Ethernet Ports is used for each modem at any
given time.
3) For CDM-760, -750, -710G, -710, -700 modems: When the modem is Offline, although all
GigE port(s) are unavailable, the M&C Ethernet port remains functional and available for
operation.
4) Installation must use a true switching device, not a hub device.
1.3.1.1.2 CDM-625/A (with Optional IP Packet Processor) – Router Mode
All configuration changes can only be made to the Online Modem and will require you
to “Save Parameters to permanent storage” to ensure the configuration change is also
applied to the Backup Modem.
For the CDM-625/A with the optional IP Packet Processor installed and enabled and the
configuration set for Router Mode, you need to provide an external Ethernet switch.
In Router Mode, both modems must be assigned a unique Management IP address on the same
subnet (172.18.10.21/24 and 172.18.10.22/24 as shown in Figure 1-6 and Figure 1-7). This is
used to share the param file. A Traffic IP address on the subnet must also be assigned
(172.18.10.20/24) in the Online modem.
The Traffic IP Address must be different from either Management IP Address.
Whichever modem is Online will assume the Traffic IP. When there is a switchover to the
backup modem, this modem will now assume the Traffic IP. Per Figure 1-7, the backup modem