Netgear XCM8810 Chassis Hardware Installation Guide - Page 194

NETGEAR 8800 Chassis Switch CLI Manual Use this command to enable jumbo frame support or for IP fragmentation with jumbo frames. Jumbo frames are Ethernet frames that are larger than 1522 bytes, including 4 bytes used for CRC. Both endstations involved in the transfer must be capable of supporting jumbo frames. The switch does not perform IP fragmentation or participate in MTU negotiation on behalf of devices that do not support jumbo frames. When enabling jumbo frames and setting the MTU size for the VLAN, keep in mind that some network interface cards (NICs) have a configured maximum MTU size that does not include the additional 4 bytes of CRC included in a jumbo frame configuration. Ensure that the NIC maximum MTU is at or below the maximum MTU size configured on the switch. Frames that are larger than the MTU size configured on the switch are dropped at the ingress port. If you use IP fragmentation with jumbo frames and you want to set the MTU size greater than 1500, all ports in the VLAN must have jumbo frames enabled. Example The following command sets the MTU size to 2000 for VLAN sales: configure ip-mtu 2000 vlan sales configure jumbo-frame-size configure jumbo-frame-size Description Sets the maximum jumbo frame size for the switch. Syntax Description framesize Specifies a maximum transmission unit (MTU) size for a jumbo frame. The range is 1523 to 9216; the default is 9216. Default Jumbo frames are disabled by default. The default size setting is 9216. Usage Guidelines Jumbo frames are used between endstations that support larger frame sizes for more efficient transfers of bulk data. Both endstations involved in the transfer must be capable of supporting jumbo frames. The framesize keyword describes the maximum jumbo frame size "on the wire," and includes 4 bytes of cyclic redundancy check (CRC) plus another 4 bytes if 802.1Q tagging is being used. To enable jumbo frame support, you must configure the maximum transmission unit (MTU) size of a jumbo frame that will be allowed by the switch. 194 | Chapter 5. Commands for Configuring Slots and Ports on a Switch