Brocade Communications Systems Brocade 8/12c Command Reference Manual page 736

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portCmd
bad CRC payloads rx
out of seq PDUs rx
flow control count
last rtt
When issued with the ipperf option, this command determines characteristics of the path to the remote
host. The output of the --ipperf -S command includes the following information:
Sampling frequency(s)
Total Time(s)
BW
WBW
Loss(%)
Delay(ms)
PMTU
VLAN tagging ensures that test traffic traverses the same path as real FCIP traffic. A VLAN tag entry
must exist prior to issuing the --ping or --traceroute commands; this includes both the local and remote
sides. A VLAN Tag table entry is dynamically maintained by the ipperf application.
NOTES
The -crc option to portCmd --tperf is no longer supported as of Fabric OS v7.0.0.
End-to-end path characterization is not supported if an IPSec-enabled tunnel exists that uses the same
source/local IP address.
Make sure to use the --ping and --ipperf commands with a double-dash (--). If the dashes are omitted, a
message displays indicating that the command is deprecated.
The execution of this command is subject to Virtual Fabric or Admin Domain restrictions that may be in
place. Refer to Chapter 1, "Using Fabric OS Commands" and Appendix A, "Command Availability" for
details.
702
Number of bad CRC payloads received.
Number of out-of-sequence PDUs received.
Flow control count.
Last Round trip in milliseconds (RT traffic only).
The interval specified with the -i option or the default (30 seconds).
The time in seconds the command has been running since it was last issued.
The bandwidth measured in the last interval. Bandwidth is defined as the total
number of transmitted packets in bytes. BW represents what the FCIP tunnel and
the FC application register as throughput rather than the Ethernet on-the-wire
bytes.
The current bandwidth weighted with a gain of 50%.
The number of TCP retransmits. This number averages the TCP retransmit rate
over the last display interval.
The smoothed TCP round-trip time and variance estimate in milliseconds.
The path maximum transmission unit (MTU) represents the largest IP layer
datagram that can be transmitted over the end-to-end path without fragmentation.
This value is measured in bytes and includes the IP header and payload. There is
limited support for black hole PMTU detection. PTMUs of decreasing size are
sent: Jumbo PMTU (greater than 1500 bytes), 1500 bytes, and 1260 bytes, the
minimum PMTU supported for FCIP tunnels. If the 1260 PMTU transmission fails,
the --ipperf command terminates. There is no support for aging. During black
hole PMTU detection the BW, WBW, Loss and PMTU values printed may not be
accurate.
Fabric OS Command Reference
53-1001764-01