Product specifications

Switch Infrastructure Diagnostics
166
Ping Stack
If a member of the stack is not reachable, make sure the stacking cable to the problem switch is plugged in and has
link at both ends. Check Hardware tests to be sure that the stacking link is not running at the wrong speed or
suspected of having an intermittent link. Also, check test results in the Stacking test group in case there was a
stacking error. Lastly, make sure Counters and Registers do not indicate errors have occurred on this stack port.
Hardware
Intermittent Link
An intermittent link is reported if the number of link ups or link downs on a port exceeds a predefined threshold.
Keep the following in mind when viewing this report for the port that is reporting a possible intermittent link:
• Have you unplugged and plugged in a cable to this port several times since the last time Switch Diagnostics was
run?
• If the port is for a Storage Blade, have you reseated this Storage Blade several times since the last time Switch
Diagnostics was run? Has the Storage Blade rebooted several times since the last time Switch Diagnostics was
run?
• If the port is for a client, have you rebooted this client several times since the last time Switch Diagnostics was
run?
If you answered yes to any of the above, then these results do not necessarily indicate a hardware problem with the
reported port or link. If there is no obvious explanation for the numerous link ups and link downs reported, there
could be a hardware problem with the switch port, the cable, or the port on the other end (not the switch).
Intermittent Link statistics are cleared each time Diagnostics is run. To keep these results, download the Diagnostics
results before running Diagnostics again.
Link Status
Whenever possible, Switch Diagnostics indicate ports that are down for ports that are supposed to be in use. All
Storage Blades and all ports that are members of Link Aggregation groups are expected to have link. If they do not,
they will be flagged within Switch Diagnostics as suspect. See Port Link Information for status on other ports.
Port Speeds
By default, client ports will not negotiate to any speed except 1000Mbps. Therefore, by default, if any client port
was configured to run at a speed other than 1000Mbps, then link would not be established. If any client port is
reporting a speed other than 1000Mbps, then it is possible that the default behavior was explicitly overridden. Do the
following:
1. Configure the Client to run at 1000Mbps.
2. Reboot the switch.