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PA-E3 Serial Port Adapter Installation and Configuration
OL-3502-04
Chapter 4 Configuring the PA-E3
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
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, “
,” to finish checking network connectivity.
Using loopback Commands
Use the loopback {dte | local | network {line | payload} command to troubleshoot the E3 serial port
adapter at the physical interface level. The command loops all packets from the E3 interface either back
to the interface or from the network back out toward the network. Use the no form of the command to
remove the loop.
The following examples of the loopback {dte | local | network {line | payload} command configure
loopback modes on the single interface (interface 0) of a one-port E3 serial port adapter in port adapter
slot 0 of a VIP2 in chassis slot 10 of a Cisco 7500 series router:
To set the interface into loopback data terminal equipment (DTE) mode, which loops the router output
data back toward the router (after the line interface unit), use the loopback dte command as follows:
Router#
configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)#
interface serial 10/0/0
router(config-if)#
loopback dte
To set the interface into local loopback mode, which loops the router output data back toward the router
at the framer, use the loopback local command as follows:
Router#
configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)#
interface serial 10/0/0
router(config-if)#
loopback local
