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Advanced FCIP Profile Configuration
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
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Minimum Retransmit Timeout
You can control the minimum amount of time TCP waits before retransmitting. By default, this value is
200 milliseconds (ms).
To configure the minimum retransmit time, follow these steps:
Command
Step 1
switch(config-profile)# tcp
min-retransmit-time 500
switch(config-profile)# no tcp
min-retransmit-time 500
Keepalive Timeout
You can configure the interval that the TCP connection uses to verify that the FCIP link is functioning.
This ensures that an FCIP link failure is detected quickly even when there is no traffic.
If the TCP connection is idle for more than the specified time, then keepalive timeout packets are sent
to ensure that the connection is active. This command can be used to tune the time taken to detect FCIP
link failures.
You can configure the first interval during which the connection is idle (the default is 60 seconds). When
the connection is idle for the configured interval, eight keepalive probes are sent at 1-second intervals.
If no response is received for these eight probes and the connection remains idle throughout, that FCIP
link is automatically closed.
Only the first interval (during which the connection is idle) can be changed.
Note
To configure the first keepalive timeout interval, follow these steps:
Command
Step 1
switch(config-profile)# tcp
keepalive-timeout 120
switch(config-profile)# no tcp
keepalive-timeout 120
Cisco MDS 9000 Family Configuration Guide
33-8
Path MTUs, page 33-9
Selective Acknowledgments, page 33-9
Window Management, page 33-9
Buffer Size, page 33-11
Monitoring Congestion, page 33-10
Estimating Maximum Jitter, page 33-11
Purpose
Specifies the minimum TCP retransmit time for the TCP
connection to be 500 ms. The default is 200 ms and the range
is from 200 to 5000 ms.
Reverts the minimum TCP retransmit time to the factory
default of 200 ms.
Purpose
Specifies the keepalive timeout interval for the TCP
connection in seconds (120). The range is from 1 to 7200
seconds.
Reverts the keepalive timeout interval to the default 60
seconds.
Chapter 33
Configuring FCIP
OL-6973-03, Cisco MDS SAN-OS Release 2.x
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