Ethernet Port Configuration Commands 139DescriptionUse the jumboframe enable command to permit jumbo frames to pass the cardon the specified slot and set the maximum size of Jumbo frames.Use the jumboframe disable slot command to prohibit jumbo frames frompassing the card on the specified slot.By default, jumbo frame is permitted to pass cards.Related command: display jumboframe configuration.n The system supports discrete values of Jumbo frame lengths ranging from 1536 to10240. However, effective Jumbo frame values fall into several sections: theeffective Jumbo frame value for the 1536-1552 section is 1552, that for the1553-9022 section is 9022, that for the 9023-9192 section is 9192, and that forthe 9193-10240 section is 10240.Example# Permit jumbo frames to pass the card on slot 6 and set the maximum size ofJumbo frames to 9022 .system-view[SW8800] jumboframe enable 9022 slot 6loopback Syntaxloopback { external | internal }undo loopbackViewEthernet port viewParameterexternal: Ethernet port in external loop mode. Presently, the Ethernet ports of the3Com Switch 8800 Family Series Routing Switches do not support this mode.internal: Ethernet port in internal loop mode.DescriptionUse the loopback command to set the Ethernet port in loop mode.Use the undo loopback command to cancel the loop setting.By default, the Ethernet port is not in loop mode.Example# Configure Ethernet2/1/1 in internal loop mode.system-viewSystem View: return to User View with Ctrl+Z.[SW8800]interface ethernet2/1/1[3Com-Ethernet2/1/1] loopback internal
