Cisco PA-POS-2OC3, Руководство по установке и настройке

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4-5
PA-POS-2OC3 Two-Port Packet-over-SONET Port Adapter Installation and Configuration
OL-3028-06
Chapter 4 Configuring the PA-POS-2OC3
Customizing the Configuration
Customizing the Configuration
You can customize 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
PA-POS-2OC3 configuration:
•
Setting the MTU Size, page 4-5
• Configuring Framing, page 4-6
•
Setting the Source of the Transmit Clock, page 4-6
• Configuring Cyclic Redundancy Checks, page 4-6
•
Configuring SONET Payload Scrambling, page 4-7
• Configuring APS, page 4-7
Note The interface subcommands that follow function the same regardless of the platform in which your
PA-POS-2OC3 is installed; however, all these commands require that you first enter the
interface pos
command to select the interface that you want to configure.
In all the configuration examples that follow, the interface address argument for the interface pos
command is for a Cisco 7200 VXR router: 3/0 (port adapter slot 3, interface 0).
For the appropriate interface pos command syntax to use for your particular platform, see Table 4-2 on
page 4-3 .
Setting the MTU Size
Note
The default value, 4470 bytes, exactly matches the maximum transmission unit (MTU) of the fiber
distributed data interface (FDDI) and high-speed serial interface (HSSI) interfaces for autonomous
switching.
The default MTU size is 4470 bytes.
Step 1
To set the MTU size, enter the mtu bytes command, where bytes is a value in the range of 64 to 9216.
Router(config)# interface pos 3/0
Router(config-if)# mtu 3000
Step 2
To restore the default of 4470 bytes, enter the no mtu command.