HP MSR2000/3000/4000 Router Series Layer 3 - IP Services Command Reference

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Use undo ip virtual-reassembly to disable IP virtual fragment reassembly.
Syntax
ip virtual-reassembly [ drop-fragments | max-fragments number | max-reassemblies number | timeout
seconds ] *
undo ip virtual-reassembly
Default
The IP virtual fragment reassembly feature is disabled.
Views
Layer 3 Ethernet interface view, VLAN interface view, Synchronous serial interface view, Asynchronous
serial interface view
Predefined user roles
network-admin
Parameters
drop-fragments: Drops all fragments.
max-fragments number: Specifies the maximum number of fragments per reassembly. The value range
is 1 to 255, and the default is 16.
max-reassemblies number: Specifies the maximum number of concurrent reassemblies. The value range
is 1 to 1024, and the default is 64.
timeout seconds: Specifies the timeout interval of a reassembly in seconds. The value range is 1 to 64,
and the default is 3 seconds.
Usage guidelines
This command also allows you to set the maximum number of fragments per reassembly, the maximum
number of concurrent reassemblies, and the timeout interval of a reassembly.
• When the maximum number of concurrent reassemblies is reached, the device discards all
subsequent fragments that do not belong to any existing assemblies and sends a syslog message.
• When the maximum number of fragments per reassembly is reached, the device discards all
fragments of the reassembly and sends a syslog.
• When the fragments of a datagram (in a reassembly) are not reassembled within the timeout
interval, all the fragments of the reassembly are discarded.
If you specify the drop-fragments keyword with any other parameters in the command, only the
drop-fragments keyword takes effect and the device drops all incoming fragments on the interface.
Examples
# Enable the IP virtual fragment reassembly feature on Ethernet 1/1.
<Sysname> system-view
[Sysname] interface ethernet 1/1
[Sysname-Ethernet1/1] ip virtual-reassembly
reset tcp statistics
Use reset tcp statistics to clear TCP traffic statistics.