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To enable CRC5 on the JT2 interfaces, specify the slot and port address of the interface and the number
of bits to use in the CRC (using crc 32), followed by the command crc bits 5. Press Ctrl-Z after altering
the configuration and before exiting configuration mode.
The example that follows shows how to enable CRC5 generation on a JT2 interface and also how to set
the CRC size to 32 bits; the example refers to JT2 interface 0 on the first JT2 port adapter on a VIP2 in
interface processor slot 3:
Checking the Configuration
After configuring the new interface, use the show commands to display the status of the new interface
or all interfaces, and use the ping command to check connectivity.
Using show Commands to Verify the New Interface Status
The following steps use show commands to verify that the new interfaces are configured and operating
correctly.
Display the system hardware configuration with the show version command to ensure that the list
Step 1
includes the new interfaces.
Display all the current interface processors and their interfaces with the show controllers cbus
Step 2
command. Verify that the new JT2 port adapter appears in the correct slot.
Specify one of the new interfaces with the show interfaces type slot/port-adapter/interface command
Step 3
and verify that the first line of the display specifies the interface with the correct slot number. Also
verify that the interface and line protocol are in the correct state: up or down.
Display the protocols configured for the entire system and specific interfaces with the show protocols
Step 4
command. If necessary, return to configuration mode to add or remove protocol routing on the system
or specific interfaces.
Display the running configuration file with the show running-config command. Display the
Step 5
configuration stored in NVRAM using the show startup-config command. Verify that the
configuration is accurate for the system and each interface.
If the interface is down and you configured it as up, or if the displays indicate that the hardware is not
functioning properly, ensure that the network interface is properly connected and terminated. If you still
have problems bringing the interface up, contact a service representative for assistance.
Using show Commands to Display Interface and System Information
To display information about a specific interface, use the show interfaces command with the interface
type and port address in the format show interfaces [type slot/port-adapter/port].
OL-3587-01
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface serial 3/0/0
Router(config-int)# crc 32
Router(config-int)# crc bits 5
Router(config-int)# ^Z
To disable CRC5 and return to the default of no CRC error checking, specify
the slot and port address and use the no crc bits 5 command.
PA-2JT2 6.3-MHz Serial Port Adapter Installation and Configuration
VIP2 and the JT2 Port Adapter
19
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