Network OS Administration Guide

Supporting Network OS 6.0.1a

Part Number: 53-1003768-04

Monitoring Fibre Channel ports

To monitor a Fibre Channel port, in privileged EXEC mode, enter the show interface FibreChannel rbridge-id/slot/port command for the Fibre Channel port you want to monitor. The command output provides lots of information about the various hardware counters associated with the port.

This command has a basic version and a detail version. The basic version of the command provides general port information such as status, identification, and configuration information, along with interrupt statistics, link status counters, and so on, as shown in the following example:

switch# show interface FibreChannel 66/0/1
 
fibrechannel 66/0/1 is down (No_Light).  Protocol state is down.
Pluggable media present
LineSpeed Actual:               
PortSpeed:                      N8Gbps
portDisableReason:              Persistently disabled port
PortId:                         010000
PortIfId:                       43010000
PortWwn:                        20:00:00:27:f8:d4:79:be
Distance:                       normal
FEC:                            Inactive

Last clearing of show interface counters: 00:00:00
Interrupts:        0          Link_failure: 0          Frjt:         0          
Unknown:           0          Loss_of_sync: 0          Fbsy:         0          
Lli:               0          Loss_of_sig:  0          
Proc_rqrd:         0          Protocol_err: 0          
Timed_out:         0          Invalid_word: 0          
Rx_flushed:        0          Invalid_crc:  0          
Tx_unavail:        0          Delim_err:    0          
Free_buffer:       0          Address_err:  0          
Overrun:           0          Lr_in:        0          
Suspended:         0          Lr_out:       0          
Parity_err:        0          Ols_in:       0          
2_parity_err:      0          Ols_out:      0          
CMI_bus_err:       0          

Rate info:
  Bandwidth:       8.00G
  Tx performance:  0 B/sec
  Rx performance:  0 B/sec

The detailed version of the command, illustrated below, tells you how much traffic has been transmitted or received, and how many times certain error conditions have occurred. Specifically, the tim_txcrd_z counters tell you how many times the port was unable to transmit frames because the transmit BB credit was zero. A number greater than zero indicates either that there is congestion on the port or that a device is affected by latency. A larger number indicates a greater problem. A sample is taken every 2.5 microseconds.

switch# show interface FibreChannel 66/0/1 detail
 
fibrechannel 66/0/1 is down (No_Light).  Protocol state is down.
Pluggable media present
LineSpeed Actual:               
PortSpeed:                      N8Gbps
portDisableReason:              Persistently disabled port
PortId:                         010000
PortIfId:                       43010000
PortWwn:                        20:00:00:27:f8:d4:79:be
Distance:                       normal
FEC:                            Inactive

Last clearing of show interface counters: 00:00:00
Rx Statistics:
        stat_wrx                0           4-byte words received
        stat_frx                0           Frames received
Tx Statistics:
        stat_wtx                0           4-byte words transmitted
        stat_ftx                0           Frames transmitted
Error Statistics:
        er_enc_in               0           Encoding errors inside of frames
        er_crc                  0           Frames with CRC errors
        er_trunc                0           Frames shorter than minimum
        er_toolong              0           Frames longer than maximum
        er_bad_eof              0           Frames with bad end-of-frame
        er_enc_out              0           Encoding error outside of frames
        er_bad_os               0           Invalid ordered set
        er_crc_good_eof         0           Crc error with good eof

Port Error Info:
        loss_of_sync:           0
        lossofsig:              0
        frjt:                   0
        fbsy:                   0

Buffer Information:
 Lx       Max/Resv    Buffer   Needed     Link        Remaining
 Mode     Buffers     Usage    Buffers    Distance    Buffers
=================================================================
 -         8            0         0        -             0  

Rate info:
  Bandwidth:       8.00G
  Tx performance:  0 B/sec
  Rx performance:  0 B/sec