Repair Information
98
Edge Switch 2/12 Service Manual
The # of Wraps column tracks the number of times the counter wraps for
rapidly-growing statistics. The maximum counter value is 2
32
entries. The page
displays the following tables of cumulative port statistics and error count values
for a selected port:
■
Traffic statistics - These entries provide information about port traffic,
including:
— Fibre Channel frames received and transmitted.
— Four-byte words received and transmitted.
— Offline sequences received and transmitted.
— Link resets received and transmitted.
— Loop initialization primitives (LIPs) generated and detected.
— Percent link utilization (receive and transmit).
■
Error statistics - The Port Stats page displays the following error statistics
for the port:
— Link failures - Link failures are recorded in response to a not operational
sequence (NOS), protocol timeout, or port failure.
— Sync losses - Synchronization losses are detected because an attached
device was reset or disconnected from the port.
— Signal losses - Signal losses are detected because an attached device was
reset or disconnected from the port.
— Primitive sequence errors - Incorrect primitive sequences are received
from an attached device, indicating Fibre Channel link-level protocol
violations.
— Discarded frames - Received frames could not be routed and were
discarded because the frame timed out (insufficient buffer-to-buffer
credit) or the destination device was not logged into the switch.
— Invalid transmission words - Several transmission words were received
with encoding errors, indicating an attached device is not operating in
conformance with the Fibre Channel specification.
— CRC errors - Received frames failed cyclic redundancy check (CRC)
validation, indicating the frames arrived at the switch port corrupted.
Frame corruption may be caused by device disconnection, an optical
transceiver failure at the device, a bad fiber-optic cable, or a poor cable
connection.
