ip tcp path-mtu-discovery
Use this command to enable PMTU(Path Maximum Transmission Unit) discovery function for TCP in global
configuration mode. Use the no form of this command to disable this function.
ip tcp path-mtu-discovery [age-timer minutes | age-timer infinite]
no ip tcp path-mtu-discovery
The time interval for further
discovery after discovering
PMTU. Range: 10-30 minutes.
Default: 10.
Based on the RFC1191, the TCP path mtu function
improves the network bandwidth utilization and data
transmission when the user uses TCP to transmit the
data in batch.
Enabling or disabling this function takes no effect for the
existent TCP connection and is only effective for the
TCP connection to be created. This command is valid
for both the IPv4 and IPv6 TCP.
According to the RFC1191, after discovering the PMTU,
the TCP uses greater MSS to detect the new PMTU at
some interval, which is specified by the parameter
age-timer. If the PMTU discovered is smaller than the
MSS negotiated between both ends of the TCP session,
the device will be trying to discover the greater PMTU at
the specified interval untill the PMTU value reaches the
MSS or the user stops using this timer. Use the
parameter age-timer infinite to stop this timer.
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