edge switch 2/32 product manager user guide

edge switch 2/32 product manager user guide 2–33
Monitoring and Managing the Switch
• Link resets — The number of link reset protocol frames received/transmitted by
this port from/to the attached Switch. The Switch transmits a link reset to initiate
the link reset protocol or recover from a link timeout. This occurs normally to
establish BB_Credit or on any port in order to recover lost BB_Credit. The Switch
receives a link reset from an attached device if the device wishes to initiate the
link reset or recover from a link timeout.
There are not thresholds for these values. You may determine that a problem exists
by the rate that the value changes. BB_Credit starvation can occur if data is sent to
a device faster than it can consume the frames. This can backup into ISLs causing
degraded performance.
Class 2 Statistics
The Class 2 Statistics table includes:
• Received Frames — The number of Class 2 frames received by this F_Port from
its attached N_Port.
• Transmitted Frames — The number of Class 2 frames transmitted by the F-Port
to its attached N_Port.
• Busied Frames — The number of F_BSY frames generated by this F_Port against
Class 2 frames. This can occur if frames are received before the Switch completes
initialization or if the Switch is servicing so many requests that it can not process
a new request. The port generates frames if the Switch is not ready to accept
commands. This may indicate temporary congestion.
• Rejected Frames — The number of F_RJT frames generated by this F_Port
against Class 2 frames.
These frames usually occur because of attached device errors. The device is
expected to correct the error based on the reject code, then retry its request. If the
device is able to recover, there is no cause for concern. If not, further
troubleshooting may be necessary. There are no thresholds for this value.
Typically, this occurs because the destination is not available due to the device’s
action.
• Four Byte Words Received — The number of four-byte words received.
• Four Byte Words Transmitted — The number of four-byte words transmitted.