Brocade Fabric OS Command Reference Manual v6.2.0 (53-1001186-01, April 2009)

Fabric OS Command Reference 633
53-1001186-01
portShow
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The second column displays link error status block counters.
The third column shows the number of F_RJTs and F_BSYs generated. For L_Ports, the third
column also displays the number of loop initialization protocols (LIPs) received, number of LIPs
transmitted, and the last LIP received.
In Fabric OS v6.2.0 or later, each GbE port is associated with a TCP history, which tracks the state
of statistics at the moment of a TCP connection failure. An entry is logged for the TCP connection
when it encounters any of the following failures:
• Maximum number of retransmits is exceeded (MAX RTX)
• Maximum keep alive timeout is exceeded (KEEPALV TO)
• RST packet is received (RESET RCVD)
You can display the TCP history with the fciptunnel -hist command. This command displays a
maximum of 16 entries. Once the maximum history length is reached, the oldest entry is removed
from the end, and the newest entry is added to the front of the TCP history as future connection
failures occur. The following data items are captured when a TCP connection encounters a failure:
Reason The reason for the TCP connection failure
RTT Round trip time
RTT H Round trip time high water mark
Var Variance
Var H Variance high water mark
OOO Counter of out-of-order segments
OOO H Out-of-order segments high water mark
Sendw Cwnd Size of sender congestion window (bytes)
Rx win Size of receive window (bytes)
Fast Rtx Fast retransmits
F Rtx H Fast retransmits high water mark
Slow Rtx Slow retransmits
InFlt H Packets in-flight high water mark
SlowStarts Counter of slow starts
Rtx TO Retransmit timeouts
Rtx Rtx TO Counter of retransmit packets due to timeout
Dup ACK Counter of duplicate ACKs
Rtx Dup ACK Counter of retransmit packets due to duplicate ACK
LPort Local port
RPort Remote port
Along with history, the system keeps track of the following TCIP statistics, which you can display
with the fciptunnel -snapshow option. The statistic is collected from system startup onwards until it
is reset with the fciptunnel -snapstart option. Subsequent calls to -snapshow display statistics
collected since the system was last reset. The TCIP statistics include the following information: