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Configuring the Interfaces
After including all of the configuration subcommands to complete your configuration, press
Step 6
Ctrl-Z—hold down the Control key while you press Z—or enter end or exit to exit configuration mode
and return to the EXEC command interpreter prompt.
Step 7
Write the new configuration to NVRAM as follows:
Router# copy running-config startup-config
[OK]
Router#
This completes the procedure for creating a basic configuration.
Customizing the Configuration
You can change the default values of all configuration parameters to match your network environment.
Use the interface subcommands in the following sections if you need to customize the OC12 POS line
card configuration:
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Note
The interface subcommands that follow function the same regardless of the platform in which your
OC12 POS line card is installed; however, all of these commands require that you first enter the
interface pos subcommand to select the interface that you want to configure.
In all of the configuration examples that follow, the interface address argument for the interface pos
subcommand is 3/1 (slot 3, interface 1) for a Cisco 7304 router.
For the appropriate interface pos subcommand syntax to use for your particular platform, see
Setting the MTU Size
The default maximum transmission unit (MTU) size is 4470 bytes. To set the MTU size, enter the
mtu bytes command, where bytes is a value in the range of 64 through 9216.
Router(config)# interface pos 3/1
Router(config-if)# mtu 3000
To restore the default of 4470 bytes, enter the no mtu command.
OC12 Packet Over SONET Line Card Installation and Configuration
4-4
Setting the MTU Size, page 4-4
Configuring Framing, page 4-5
Setting the Source of the Transmit Clock, page 4-5
Configuring Cyclic Redundancy Checks, page 4-5
Configuring SONET Payload Scrambling, page 4-5
Configuring SONET Delay Triggers, page 4-6
Chapter 4
Configuring the OC12 POS Line Card
Table
4-2.
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