4-20
PA-MC-T3-EC Port Adapter Installation and Configuration
OL-10589-02
Chapter 4 Configuring the Unchannelized Mode
Checking the Configuration
If you use the
show controllers T3
command without specifying a port address (
slot/port-adapter/port
),
all information is displayed for all T3 port adapters in the router; therefore, the resulting display output
can be extensive.
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
“Related
Documentation” section on page iv
for detailed command descriptions and examples.
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.
Proceed to the next section, “
Using loopback Commands to Troubleshoot Network Problems
,” to finish
checking network connectivity.
Using loopback Commands to Troubleshoot Network Problems
If you have difficulty with the PA-MC-T3-EC configuration or installation, you can troubleshoot the port
adapter using the
loopback
command. Refer to the
“Configuring Loopback Mode for the Serial
Interface” section on page 4-9
for instructions on setting loopbacks.
If the
ping
command to the remote IP address failed, then use loopbacks to troubleshoot the T3
connection using the following steps:
Step 1
Use the
show controller T3
and
show interfaces serial
commands to confirm that the T3 controller,
serial interface, and line protocol are up.
Step 2
Place the serial interface of the PA-MC-T3-EC in local loopback using the
loop local
command.
Step 3
Repeat the
ping
command using the IP address of the local serial interface. Using the previous example
where the remote server’s IP address was 10.0.0.10, if the local IP address is 10.0.0.5, then use the
command:
ping 10.0.0.5
If the ping is successful, proceed to Step 4. A failure indicates a configuration problem or a hardware
problem with the PA-MC-T3-EC.
Step 4
Remove the local loop with the
no loopback
command and place the remote server or DSU in network
loopback with the
loopback remote
command.
