Comtech EF Data CRS-311, Installation And Operation Manual

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CRS-311 1:1 Redundancy Switch Revision 7
Introduction MN/CRS311.IOM
1–9
When configuring the overall system using the CRS ‐ 305 RMI and CRS ‐ 316 TMI modules,
however, you must be careful to avoid networking loops. For example, either of the
following configurations is supported:
•
Configuration #1:
o
Connect port “1” of each Network Processor to the appropriate RMI/TMI Modem
side “Ethernet” port.
o
Connect the traffic data to the CRS ‐ 316 User side “Ethernet” port. Connect port “2”
of the primary NP to port “2” of the backup NP via a crossover cable.
o
No other connections are required for NP ports “3” and “4”.
•
Configuration #2:
o
Connect port “1” of each Network Processor to the appropriate RMI/TMI Modem
side “Ethernet” port.
o
Connect the traffic data to the CRS ‐ 316 User side “Ethernet” port, as per
Configuration #1.
o
Connect port “2” of the primary NP and port “2” of the backup NP to a common
Ethernet switch, which in turn shares a connection to an external network
management device.
o
Use the external network management device to monitor both modems and to
make configuration changes to the primary modem.
Other variations of the above configurations are possible. However, a configuration that is
not allowed is the connection between the two NPs via a crossover cable while also
connecting both NPs to a common external switch. This would result in a networking loop.
2. CRS ‐ 311 with 4 ‐ Port (Multi ‐ port) Ethernet: The CRS ‐ 311, using SLM ‐ 5650/5650A modems
equipped with the optional Network Processor (NP) Interface Module, may be configured
with the CRS ‐ 505 RMI and CRS ‐ 515 TMI for multi ‐ port (1 to 4 ports) Ethernet traffic. Figure
1 ‐ 6 shows the block diagram for this configuration.
Note the following restrictions, depending on the Ethernet traffic mode employed:
•
In Ethernet Router Mode , Ethernet “Port 1” on the CRS ‐ 311 must be used as a
minimum. This is a mandatory requirement, since “Port 1” on the CRS ‐ 311 RMI/TMI
allows the modems to share parameters. Optionally, “Port 2” through “Port 4” can be
used, as needed, for additional user traffic connections.
•
In Ethernet Bridge Mode , Ethernet “Port 2” through “Port 4” on the CRS ‐ 311 can be
used. However, “Port 1” MUST NOT be used, since “Port 1” is designated specifically for
Ethernet Router Mode.