HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 289

Port Traffic Controls Jumbo Frames 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-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. ProCurve(config)# show jumbos Jumbos Global Values Configured : MaxFrameSize : 9216 In Use : MaxFrameSize : 9216 Ip-MTU : 9198 Ip-MTU : 9198 Figure 13. 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. 12-8