Jumbo Frame

A Jumbo frame adopts the structure of a common Ethernet frame but does not have the requirement for the maximum length of the payload. Furthermore, the type field of the Jumbo frame is defined as 0x8870 to differentiate a Jumbo frame from a common Ethernet frame. You can set and query the jumbo frame of a board.

Navigation Path

In the NE Explorer, select a board and choose Configuration > Ethernet Interface Management > Jubmo Frame from the Function Tree.

Guideline

Both the EFT4 and EMS6 boards can receive and transmit the Jumbo frame whose length does not exceed 9600 bytes; however, the ways for these two boards to process the Jumbo frame are different.

The Ethernet port of the EFT4 board checks the type field in an Ethernet frame to determine whether the Ethernet frame is a Jumbo frame. If the Ethernet frame is a Jumbo frame, the maximum frame length is not restricted.
The Ethernet port of the EMS6 board checks whether an Ethernet frame whose length exceeds 1536 bytes is a Jumbo frame. All the frames are restricted by the maximum frame length.
VCTRUNKs 1-4 of the EFT4 board and VCTRUNKs 5-8 of the EMS6 board check whether an Ethernet frame is a Jumbo frame. If an Ethernet frame is not a Jumbo frame but its length exceeds the maximum frame length, the board discards the frame. VCTRUNKs 1-4 of the EMS6 board do not check Jumbo frames. The EMS6 board discards any frame whose length exceeds the maximum frame length.
The maximum frame length (namely, the MTU), is a parameter of the Ethernet port. In the case of common Ethernet frames, the Ethernet service board discards the frame whose length exceeds the value of this parameter.

Parameters

Field	Value	Description
Board	Equipment that supports the master and slave shelf management: shelf ID(shelf name)-slot number-board name Equipment that does not support the master and slave shelf management: slot number-board name	Displays an Ethernet board.
Jumbo Frame	0000 to FFFF	Sets and displays the jumbo frame of a board.