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Checking the Configuration
PA-E3 Serial Port Adapter Installation and Configuration
8-20
each signal that is not returned before the specified timeout is displayed as a period (.). A series of
exclamation points(!!!!!) indicatesa goodconnection; aseries ofperiods (.....) orthe message[timed
out] or [failed] indicates that the connection failed.
Following is an example of a successful ping command to a remote server with the address 10.0.0.0:
router# ping 10.0.0.0 <Return>
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echoes to 1.1.1.10, 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 server and that the server
is active (powered on),and repeat the pingcommand. Refer to the publicationslisted in the “Related
Documentation” section on page vi for complete descriptions of interface subcommands and the
configuration options available for VIP2-related interfaces, and to determine which subcommands
and configuration options support VIP2 functionality.
Using the loopback Command to Verify the Physical Interface
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 followingexamples of theloopback {dte |local | network {line |payload} commandconfigure
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:
• Set the interface into loopback data terminal equipment (DTE) mode 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
Loopback DTE loops the router output data back toward the router (after the line interface unit).
• Set the interface into local loopback mode 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
Local loopback loops the router output data back toward the router at the framer.
• Set the interface into network line loopback mode 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 network line
Network line loopback loops the data back toward the network (before the framer).