Port Traffic Controls

Jumbo Frames

 

Configuring IP MTU

 

 

N o t e

The following feature is available on the switches covered in this guide.

 

Jumbos support is required. On switches that do not support this command,

 

the IP MTU value is derived from the maximum frame size and is not config­

 

urable.

 

You can set the IP MTU globally by entering this command. The value of max-

 

 

frame-sizemust be greater than or equal to 18 bytes more than the value

 

selected for ip-mtu. For example, if ip-mtuis set to 8964, the max-frame-sizeis

 

configured as 8982.

 

Syntax: jumbo ip-mtu <size>

 

Globally sets the IP MTU size. Values range between 1500 and

 

9198 bytes. This value must be 18 bytes less than the value of

 

max-frame-size.

 

Default: 9198 bytes

 

SNMP Implementation

 

Jumbo Maximum Frame Size.

 

The maximum frame size for Jumbos is supported with the following propri­

 

etary MIB object:

 

hpSwitchMaxFrameSize OBJECT-TYPE

 

This is the value of the global max-frame-sizesupported by the switch. The

 

default value is set to 9216 bytes.

 

Jumbo IP MTU.

 

The IP MTU for Jumbos is supported with the following proprietary MIB

 

object:

 

hpSwitchIpMTU OBJECT-TYPE

 

This is the value of the global Jumbos IP MTU (or L3 MTU) supported by the

 

switch. The default value is set to 9198 bytes (a value that is 18 bytes less than

 

the largest possible maximum frame size of 9216 bytes). This object can only

 

be used in switches which support max-frame-sizeand ip-mtuconfiguration.

13-36