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Checking the Configuration
Using the ping Command to Verify Network Connectivity
Using the ping command, you can 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 viii
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] indicates 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 detect and isolate equipment malfunctions by testing the connection
between the PA-8T-232 interface and a remote device such a modem or a CSU/DSU. The loopback
command places an interface in loopback mode, which enables test packets that are generated from the
ping command to loop through a remote device or compact serial cable. If the packets complete the loop,
the connection is good. If not, you can isolate a fault to the remote device or compact serial cable in the
path of the loopback test.
You must configure a clock rate on the port before performing a loopback test. However, if no cable is
Note
attached to the port, the port is administratively up, and the port is in loopback mode; you do not have
to configure a clock rate on the port before performing a loopback test.
Depending on the mode of the port, issuing the loopback command checks the following path:
•
•
PA-8T-232 Synchronous Serial Port Adapter Installation and Configuration
5-32
1 carrier transitions
RTS up, CTS up, DTR up, DCD up, DSR up
When no compact serial cable is attached to the PA-8T-232 interface port, or if a DCE cable is
attached to a port that is configured as line protocol up, the loopback command tests the path
between the network processing engine and the interface port only (without leaving the network
processing engine and port adapter).
When a DTE cable is attached to the port, the loopback command tests the path between the network
processing engine and the near (network processing engine) side of the DSU or modem to test the
PA-8T-232 interface and compact serial cable.
Chapter 5
for detailed command descriptions and examples.
Configuring the PA-8T-232 Interfaces
"Related
OL-3562-03
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