Sun Microsystems 1.0 - Manual (Page 67)

Troubleshooting and Diagnostics 41
5
Running pf_stat without the —m option (to display
information about the local station) shows that the
ring is
ISOLATED .
Check that the link status indicator is green, indicating that the
SunFDDI/P interface is attached to an active network. Check
the connections to neighboring stations or the concentrator.
Some concentrators have diagnostic LEDs that indicate if the
ring is operating correctly.
Check that the neighboring stations are configured correctly.
If everything else seems to be working, check the cable itself.
Fiber optic cable is fragile and should not be subjected to stress
or impact. If the turning curve around objects is too tight, the
light path is interrupted. Clean the connectors.
The local station cannot reach FDDI stations located
on a remote FDDI network. Check that the IP address and host name of the remote station
is entered in the NIS map or NIS+ tables (or in
/etc/hosts
on each remote station if you are not running NIS or NIS+).
Check that the routing tables are using netstat —r . Check
for an pf interface that shows a route to a gateway with the UG
flags set. If you can reach the local gateway, then the problem
probably lies with the IP routing.
Try to confirm that the remote station is configured and
running, and if possible try to reach the local station from the
remote station. If you can, it indicates that the problem lies
with the local IP routing.
Try to reach the router nearest the remote station. If you can, it
indicates that the fault lies between the remote station and the
router. If you cannot, try to reach a router that is closer to the
local station. Continue in this way until you have isolated the
router that is dropping or misrouting packets.
If the dynamic routing protocol is not adding routes, try
adding a static route to the remote station. This method is not
recommended for large networks with a large number of
nodes.
Table 5-2 Problems Running SunFDDI/P (Continued)
Problem Action