Extreme Networks ExtremeWare XOS 11.1, Manual

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Using the Port Monitoring Display Keys
ExtremeWare XOS 11.1 Concepts Guide
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The switch collects the following port receive error information:
●
Receive Bad CRC Frames (RX CRC)—The total number of frames received by the port that were of
the correct length but contained a bad FCS value.
●
Receive Oversize Frames (RX Over)—The total number of good frames received by the port greater
than the supported maximum length of 1,522 bytes.
●
Receive Undersize Frames (RX Under)—The total number of frames received by the port that were
less than 64 bytes long.
●
Receive Fragmented Frames (RX Frag)—The total number of frames received by the port that were
of incorrect length and contained a bad FCS value.
●
Receive Jabber Frames (RX Jab)—The total number of frames received by the port that were greater
than the support maximum length and had a Cyclic Redundancy Check (CRC) error.
●
Receive Alignment Errors (RX Align)—The total number of frames received by the port with a CRC
error and not containing an integral number of octets.
●
Receive Frames Lost (RX Lost)—The total number of frames received by the port that were lost
because of buffer overflow in the switch.
Using the Port Monitoring Display Keys
Table 15 describes the keys used to control the displays that appear when you issue any of the
show
port
commands.
Slot Diagnostics
The switch provides a facility for running normal or extended diagnostics on Input/Output (I/O)
modules or Management Switch Fabric Modules (MSMs) without affecting the operation of the rest of
the system.
When you run diagnostics on a module, the switch verifies that the:
●
Registers can be written to and read from correctly
●
Memory addresses are accessed correctly
Table 15: Port monitoring display keys
Key(s) Description
U Displays the previous page of ports.
D Displays the next page of ports.
[Esc] or [Return] Exits from the screen.
0 Clears all counters.
[Space] Cycles through the following screens:
• Packets per second
• Bytes per second
• Percentage of bandwidth
Available using the
show port utilization
command only.