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VIP-4R/4T Installation and Configuration 73
VIP Port Adapter Functions
Following is an example of a successful ping command to a remote server with the address 1.1.1.10:
Router# ping 1.1.1.10 <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 ping command.
The loopback test allows you to detect and isolate equipment malfunctions by testing the connection
between the 4T port adapter interface and a remote device such as modems or CSU/DSUs. The
loopback subcommand sends a series of packets out to and through the device (or cable), and back
to the 4T port adapter interface. If the packets complete the loop, the connection is good. If not, you
can isolate a fault to the remote device or interface cable in the path of the loopback test.
Note You must 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:
• When no interface cable is attached to the 4T port adapter interface, or if a DCE cable is attached
to the port, the loopback command tests the path between the VIP and the interface port only
(without leaving the VIP and port adapter).
• When a DTE cable is attached to the port, the loopback command tests the path between the VIP
and the near (VIP) side of the DSU or modem to test the 4T port adapter interface and interface
cable. (The X.21 DTE interface cable does not support this loopback test; see the following
Note.)
Refer to the appropriate software configuration document for command descriptions and examples.
Note The X.21 interface definition does not include a loopback definition. On the 4T port adapter,
the X.21 DTE interface does not support the loopback function. Because of the internal clock signal
present on the 4T port adapter interfaces, loopback will function on an X.21 DCE interface.
This completes the configuration procedure for the new 4T port adapter serial interfaces.