HP 2910AL - Manual (Page 325)

Port Traffic Controls
Jumbo Frames
Displaying the Maximum Frame Size
Use the show jumbos command to display the globally configured untagged
maximum frame size for the switch.
ProCurve(config)# show jumbos
Jumbos Global Values
Configured : MaxFrameSize : 9216 Ip-MTU : 9198
In Use : MaxFrameSize : 9216 Ip-MTU : 9198
Figure 13-5. Displaying the Maximum Frame Size and IP MTU Values
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.
■ Jumbo support must be enabled for a VLAN from the CLI or through
SNMP.
■ Setting the maximum frame size does not require a reboot.
■ When you upgrade to a version of software that supports setting the
maximum frame size from a version that did not, the
max-frame-size
value is set automatically to 9216 bytes.
■ Configuring a Jumbo maximum frame size on a VLAN allows frames
up to
max-frame-size even though other VLANs of which the port is a
member are not enabled for Jumbo support.
Operating Notes for Jumbo Traffic-Handling
■ ProCurve does not recommend configuring a voice VLAN to accept jumbo
frames. Voice VLAN frames are typically small, and allowing a voice VLAN
to accept jumbo frame traffic can degrade the voice transmission perfor­
mance.
■ You can configure the default, primary, and/or (if configured) the manage­
ment VLAN to accept jumbo frames on all ports belonging to the VLAN.
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