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4-2

OC12 Packet Over SONET Line Card Installation and Configuration

OL-3437-01

Chapter4 Configuring the OC12 POS Line Card

Configuring the Interfaces

After you verify that the new OC12 POS line card is installed correctly (the STATUS LED goes on), use

the privileged-level configure command to configure the new interface. Have the following information

available:

• IP address, if you plan to configure the interface for IP routing

• MTU size

• Framing mode

• Transmit clock source

• Loopback modes (if testing is required)

If you installed a new OC12 POS line card or if you want to change the configuration of an existing

interface, you must enter configuration mode to configure the new interfaces. If you replaced an OC12

POS line card that was previously configured, the system recognizes the new interfaces and brings each

of them up in their existing configuration.

For a summary of the configuration options available and instructions for configuring the interface on

an OC12 POS line card, refer to the appropriate configuration publications listed in the “Related

Documentation” section on page viii.

You execute configuration commands from the privileged level of the EXEC command interpreter,

which usually requires password access. Contact your system administrator, if necessary, to obtain

password access. (See the “Using the EXEC Command Interpreter” section on page 4-1 for an

explanation of the privileged level of the EXEC.)

On power up, the POS interface on a new OC12 POS line card is shut down. To enable the interface, you

must enter the no shutdown command in configuration mode.

When the POS interface is enabled (taken out of shutdown) with no additional arguments, the interface

configuration file parameters use the default values. (See Table 4-1 for parameters and default values.)

Table 4-1 OC12 POS Line Card Configuration Default Values

Parameter Configuration Commands Default Value

MTU mtu bytes (no mtu bytes) 4470 bytes

Framing pos framing-sdh (no pos framing-sdh) SONET framing

Loopback internal loop internal (no loop internal)No internal

loopback

Loopback line loop line (no loop line) No line loopback

Transmit clocking source clock source internal

clock source line

Loop timing

Cyclic redundancy checks crc 16

crc 32

16-bit CRC

SONET payload

scrambling

pos scramble-atm (no pos

scramble-atm)

No SONET payload

scrambling

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 49 50

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