ERX-7xx Models, ERX-14xx Models, and the ERX-310 Router

Use the slot/port format to identify unchannelized SONET/SDH interfaces. Interfaces that support APS/MSP also use the APS/MSP channel number.

• slot—Number of the slot in which the line module resides in the chassis.

  In ERX-7xx models, line module slots are numbered 2–6; slots 0 and 1 are reserved for SRP modules. In ERX-14xx models, line module slots are numbered 0–5 and 8–13; slots 6 and 7 are reserved for SRP modules. In an ERX-310 router, line module slots are numbered 1–2; slot 0 is reserved for the SRP module.

• port—Number of the port on the I/O module.

  On the OC3-2 GE APS I/O module, you can configure only unchannelized SONET/SDH interfaces on ports 0 and 1; port 2 is reserved for a Gigabit Ethernet interface.

  On I/O modules that support APS/MSP, each primary port has a corresponding redundant port. The number of the primary port, but not that of the redundant port, is used to identify the interface. The primary port is above the corresponding redundant port on the I/O modules.

  Primary port numbers range from 0 to n–1, where n is the total number of primary ports on the module. For example, if a module has one primary port, that port is labeled 0. On some I/O modules, redundant ports are labeled with a port number followed by the letter R. For example, port 3R is the redundant port for the primary port labeled 3. However, on some two-port modules, the primary port is labeled 0 and the redundant port is labeled 1.

  On I/O modules that support APS/MSP, the port numbers for the working (primary) interfaces are assigned the lower half of the numbered interfaces, whereas the port numbers for the protect (redundant) interfaces are assigned the upper half of the numbered interfaces. For example, on an I/O module that provides four primary ports and four redundant ports, the working interface ports are numbered 0–3 and the protect interface ports are numbered 4–7. Similarly, on an I/O module that provides one primary port and one redundant port, the working interface is port 0 and the protect interface is port 1.

• APS/MSP channel number—Identifier of the working or protect (redundant) interface for configuration purposes. (See Bidirectional Switching Mode.)

  The protect interface is always assigned channel number 0. The working interface is always assigned channel number 1.

See Configuring Channelized T3 Interfaces, for information about slot numbering.

For information about installing line modules and I/O modules in ERX routers, see ERX Hardware Guide, Chapter 4, Installing Modules.

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