Failure Of Network Communications - Sun Microsystems 6500 Installation Manual

3.4

Failure of Network Communications

Description of the Problem
The system cannot communicate with a network if the system and the network hub
are not set in the same way for the Ethernet link integrity test. This problem
particularly applies to 10BASE-T network hubs, where the Ethernet link integrity
test is optional. This is not a problem for 100BASE-T networks, where the test is
enabled by default.
If you connect the system to a network and the network does not respond, use the
OpenBoot command watch-net-all to display conditions for all network
connections:
ok watch-net-all
For SBus Ethernet cards, the test can be enabled or disabled with a hardware jumper,
which you must set manually. For the TPE and MII onboard ports on the I/O+
board, the link test is enabled or disabled through software, as shown below.
Remember also that the TPE and MII ports are not independent circuits and as a
result, both ports cannot be used at the same time.
Note – Some hub designs do not use a software command to enable/disable the
test, but instead permanently enable (or disable) the test through a hardware jumper.
Refer to the hub installation or user manual for details of how the test is
implemented.
Determining the Device Names of the I/O+ Boards
To enable or disable the link test for an onboard TPE (hme) port, you must first know
the device name for the I/O+ board. To list the device names:
1. Shut down the system and take the system into OpenBoot.
2. Determine the device names of the I/O+ boards:
Chapter 3 Powering the System On and Off 3-15