N8406-023 1Gb Intelligent L3 Switch Command Reference Guide (ISCLI) 69
TCP statistics
The following command displays TCP statistics:
show ip tcp counters
Command mode:
All except User EXEC
TCP statistics:
tcpRtoAlgorithm: 4 tcpRtoMin: 0
tcpRtoMax: 240000 tcpMaxConn: 2048
tcpActiveOpens: 252214 tcpPassiveOpens: 7
tcpAttemptFails: 528 tcpEstabResets: 4
tcpInSegs: 756401 tcpOutSegs: 756655
tcpRetransSegs: 0 tcpInErrs: 0
tcpCurBuff: 0 tcpCurConn: 3
tcpOutRsts: 417
The following table describes the Transmission Control Protocol (TCP) statistics:
Table 60 TCP statistics
Statistics
Description
tcpRtoAlgorithm
The algorithm used to determine the timeout value used for retransmitting
unacknowledged octets.
tcpRtoMin
The minimum value permitted by a TCP implementation for the retransmission
timeout, measured in milliseconds. More refined semantics for objects of this type
depend upon the algorithm used to determine the retransmission timeout. In
particular, when the timeout algorithm is rsre(3), an object of this type has the
semantics of the LBOUND quantity described in Request For Comments (RFC) 793.
tcpRtoMax
The maximum value permitted by a TCP implementation for the retransmission
timeout, measured in milliseconds. More refined semantics for objects of this type
depend upon the algorithm used to determine the retransmission timeout. In
particular, when the timeout algorithm is rsre(3), an object of this type has the
semantics of the UBOUND quantity described in RFC 793.
tcpMaxConn
The limit on the total number of TCP connections the switch can support. In entities
where the maximum number of connections is dynamic, this object should contain
the value -1.
tcpActiveOpens
The number of times TCP connections have made a direct transition to the SYN-
SENT state from the CLOSED state.
tcpPassiveOpens
The number of times TCP connections have made a direct transition to the SYN-
RCVD state from the LISTEN state.
tcpAttemptFails
The number of times TCP connections have made a direct transition to the CLOSED
state from either the SYN-SENT state or the SYN-RCVD state, plus the number of
times TCP connections have made a direct transition to the LISTEN state from the
SYN-RCVD state.
tcpEstabResets
The number of times TCP connections have made a direct transition to the CLOSED
state from either the ESTABLISHED state or the CLOSE- WAIT state.
tcpInSegs
The total number of segments received, including those received in error. This count
includes segments received on currently established connections.
tcpOutSegs
The total number of segments sent, including those on current connections but
excluding those containing only retransmitted octets.
tcpRetransSegs
The total number of segments retransmitted, that is, the number of TCP segments
transmitted containing one or more previously transmitted octets.
tcpInErrs
The total number of segments received in error (for example, bad TCP checksums).
tcpCurBuff
The total number of outstanding memory allocations from heap by TCP protocol
stack.
tcpCurConn
The total number of outstanding TCP sessions that are currently opened.
tcpOutRsts
The number of TCP segments sent containing the reset (RST) flag.
