4-2
OC12 Packet Over SONET Line Card Installation and Configuration
OL-3437-01
Chapter 4 Configuring the OC12 POS Line Card
Configuring the Interfaces
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
Documentation” section on page 8
.
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
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
