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Chapter 4
Configuring the PA-POS-2OC3
Using the ping Command to Verify Network Connectivity
You can use the ping command to verify that an interface port is functioning properly. This section
provides a brief description of this command. Refer to the publications listed in the
Documentation" section on page iv
The ping command sends echo request packets out to a remote device at an IP address that you specify.
After sending an echo request, the system waits a specified time for the remote device to reply. Each
echo reply is displayed as an exclamation point (!) on the console terminal; each request that is not
returned before the specified timeout is displayed as a period (.). A series of exclamation points (!!!!!)
indicates a good connection; a series of periods (.....) or the messages (timed out) or (failed) indicate a
bad connection.
Following is an example of a successful ping command to a remote server with the address 10.0.0.10:
Router# ping 10.0.0.10 <Return>
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echoes to 10.0.0.10, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/15/64 ms
Router#
If the connection fails, verify that you have the correct IP address for the destination and that the device
is active (powered on), and repeat the ping command.
Using loopback Commands
The loopback test allows you to troubleshoot, detect, and isolate equipment malfunctions by testing the
connection between the OC-3 interface and a remote device. The loopback command places an interface
in internal loopback (also called local loopback) or line loopback mode, which enables test packets that
are generated from the ping command to loop through a remote device or a cable. If the packets complete
the loop, the connection is good. If not, you can isolate a fault to the remote device or the cable in the
path of the loopback test.
Engaging line loopback automatically switches the interface to loop timing. The interface switches back
Note
to the user-specified timing source once the loopback is disengaged.
Configuring an Interface for Internal Loopback
The default loopback setting is for no loopback. With internal (or local) loopback, packets from the
router are looped back in the framer. Outgoing data gets looped back to the receiver without actually
being transmitted. Internal loopback is useful for checking that the PA-POS-2OC3 is working.
To configure an interface for internal loopback, enter the loop internal command:
Step 1
Router(config)# interface pos 3/0
Router(config-if)# loop internal
Step 2
To disable internal loopback, enter the no loop internal command.
OL-3028-06
for detailed command descriptions and examples.
PA-POS-2OC3 Two-Port Packet-over-SONET Port Adapter Installation and Configuration
Checking the Configuration
"Related
4-29
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