Troubleshooting Fibre Channel - Cisco N5010P-N2K-BE Software Configuration Manual

Chapter 50 Troubleshooting
S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m
1 packets captured
For more information on Wireshark, see the following URL:

Troubleshooting Fibre Channel

This section describes troubleshooting methods to resolve issues with Fibre Channel. This section
includes the following topics:
•
•
fctrace
The fctrace feature provides the following capabilities:
•
•
You can invoke fctrace by providing the FC ID, the N port WWN, or the device alias of the destination.
The trace frame is routed normally through the network until it reaches the far edge of the fabric. When
the frame reaches the edge of the fabric (the F port connected to the end node with the given port WWN
or the FC ID), the frame is looped back (swapping the source ID and the destination ID) to the originator.
If the destination cannot be reached, the path discovery starts, which traces the path up to the point of
failure.
The fctrace feature works only on TE ports. Make sure that only TE ports exist in the path to the
Note
destination. If there is an E port in the path, the fctrace frame is dropped by that switch. Also, fctrace
times out in the originator, and path discovery does not start.
OL-16597-01
Destination port: telnet (23)
Sequence number: 0 (relative sequence number)
Acknowledgement number: 0
Header length: 20 bytes
Flags: 0x10 (ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 64334
Checksum: 0x934f [correct]
[Good Checksum: True]
[Bad Checksum: False]
fctrace, page 50-5
fcping, page 50-7
Trace the route followed by data traffic.
Compute inter-switch (hop-to-hop) latency.
(relative ack number)
http://www.wireshark.org/docs/
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
Troubleshooting Fibre Channel
50-5