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5–Fibre Channel over IP
Configuring FCIP
ISR651101-00 G 5-11
TCP Retransmit Timer Expired—The sender of a packet did not receive an
ACK for a packet within the retransmit time-out window. The sender will
retransmit the packet. This is typically the result of the ACK being dropped
somewhere in the WAN due to congestion or corruption of the ACK (less
likely).
The following example shows the FCIP link statistics from the router’s CLI show
statistics command. The TCP Timer Expired value consists of two
counters:
The upper 16 bits is a count of the number of retransmits resulting from
receiving duplicate ACKs (count = 34 in the example).
The lower 16 bits is a count of the number of retransmits resulting from
retransmit time outs (count = 10 in the example).
FCIP Link Statistics
-----------------------
FCIP Link 1
FC Xmit Frames 647245
FC Xmit Bytes 1290829908
FC Rcvd Frames 664413
FC Rcvd Bytes 1276994796
IP Xmit Packets 3747952
IP Xmit Byte Count 2849890416
IP Xmit Fragments 0
IP Rcvd Packets 3649896
IP Rcvd Byte Count 2856931542
IP Rcvd Fragments 0
IP Datagram Reassembly Count 0
IP V6Pkt Rcvd 34
IP Error Packets 0
IP Reassembly Errors 0
TCP Xmit Segment Count 3747952
TCP Xmit Byte Count 2729955868
TCP Xmit Acks 52598
TCP Rcvd Segment Count 3649888
TCP Rcvd Byte Count 2740134348
TCP Rcvd Acks 37708
TCP Rcvd Window Probes 0
TCP Timer Expired 340010
TCP ECC Error Corrections 0
MAC Xmit Frames 1890446