Enterasys Networks Fast Network 10 manual Loopback Tests, Status and Activity Indicators

Chapter 6: FN10 Diagnostics and Troubleshooting

6.3.1 Loopback Tests

Built-in local and remote loopback tests can be used to test individual ports while the FN10 is operational. When in local loopback mode, a port is disconnected from the network. The FN10 generates loopback packets for the port, and the port loops the packets back without sending them onto the network.

During a remote loopback test, the port is in normal operation, sending and receiving packets to the network. The FN10 generates loopback packets which are sent to a particular destination device on the port's network. The destination device echoes the packet back onto the network, and the originating port receives the packet.

For both types of tests, normal operation is indicated when generated packets are received back without errors. For remote loopback tests, the FN10 creates LLC Type 1 test packets for LANs, and Point-to-Point Protocol (PPP) echo-request packets for managing the out-of-band port.

Both types of loopback tests can be initiated by the NMS. The test results are reported to the NMS. Refer to the Fast Network 10 MIB Reference Guide for information on the MIB variables.

NOTE

Loopback testing is automatically performed whenever the FN10 boots. However, there are no LEDs for the loopback tests; the results of these tests must be observed by accurate packet transmission, or read by using an NMS to examine traps.

6.4 STATUS AND ACTIVITY INDICATORS

The front panel of the FN10 includes LEDs that indicate the status or activity of various system components. Figure 6-1 shows the FN10 front panel LEDs and buttons. The LEDs and buttons are described in Tables 6-1 and 6-2.

Page 6-4 Fast Network 10 User Guide