Configuring IP MTU
NOTE:
The following feature is available on the switches covered in this guide. jumbos support is required
for this feature. On switches that do not support this command, the IP MTU value is derived from the
maximum frame size and is not configurable.
You can set the IP MTU globally by entering this command. The value of max-frame-size must be greater than
or equal to 18 bytes more than the value selected for ip-mtu. For example, if ip-mtu is set to 8964, the max-
frame-size is 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 proprietary MIB object:
hpSwitchMaxFrameSize OBJECT-TYPE
This is the value of the global max-frame-size supported 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 be used only in switches that support max-frame-size and ip-mtu configuration.
Displaying the maximum frame size
Use the show jumbos command to display the globally configured untagged maximum frame size for the switch,
as shown in the following Example:.
switch(config)# show jumbos
Jumbos Global Values
Configured : MaxFrameSize : 9216 Ip-MTU : 9198
In Use : MaxFrameSize : 9216 Ip-MTU : 9198
For more information about frame size, see
Jumbo frames on page 133.
Operating notes for maximum frame size
• When you set a maximum frame size for jumbo frames, it must be on a global level. You cannot use the
jumbo max-frame-size command on a per-port or per-VLAN basis.
• The original way to configure jumbo frames remains the same, which is per-VLAN, but you cannot set a
maximum frame size per-VLAN.
138 Aruba 2530 Management and Configuration Guide for
ArubaOS-Switch 16.05
To Next Page