HP 6600 Command Reference Manual page 61

Syntax
mtu size
undo mtu
Default
The MTU of an Ethernet interface or subinterface is 1500 bytes.
Views
Layer 3 Ethernet interface view, Layer 3 Ethernet subinterface view
Default command level
2: System level
Parameters
size: Sets the maximum transmission unit (MTU) in the range of 46 to 2000 bytes. The MTU is in the
range of 46 to 9600 bytes for Layer 3 Ethernet interfaces on FIP-600, MCP-X1/MCP-X2, and HSR6602.
The MTU value range varies when some HIM modules are installed on different line cards or devices:
When a HIM module is installed to FIP-600, the MTU value range of some Layer 3 Ethernet interfaces
can be the following:
HIM module model
HIM-8FE
HIM-4GBE
HIM-8GBE
HIM-4GBP
HIM-8GBP
HIM-1EXPA
When a HIM module is installed to the HSR6602 or 6604/6608/6616 with MCP, the MTU value range
of some Layer 3 Ethernet interfaces can be the following:
HIM module model
HIM-8FE
HIM-4GBE
HIM-8GBE
HIM-4GBP
HIM-8GBP
HIM-1EXPA
Usage guidelines
As the size of MTU decreases, the number of fragments grows. When setting MTU for an interface, you
should consider QoS queue lengths (for example, the default FIFO queue length is 75) to avoid a too
small MTU causing packet drop in QoS queuing. To achieve the best result, you can tune MTU with the
mtu command or QoS queue lengths with the qos fifo queue-length command. For more information,
see ACL and QoS Command Reference.
MTU value range
46 to 9600
46 to 9600
46 to 9600
46 to 9600
46 to 9600
46 to 9600
MTU value range
46 to 9600
46 to 9600
46 to 9600
46 to 9600
46 to 9600
46 to 9600
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