Setting the Jumbo Frame Length Allowed on an Interface

A jumbo frame is an Ethernet frame longer than 1518 bytes or a VLAN frame longer than 1522 bytes.

When transmitting a large amount of data (such as files and videos), an Ethernet interface may receive jumbo frames. If the jumbo frame length exceeds the default data frame length that can be processed, the device directly discards the jumbo frames. You can set the jumbo frame length allowed on an interface.

After you configure the device to allow jumbo frames, packet forwarding becomes more flexible. If multiple common Ethernet frames are used to transmit a data packet, many redundant contents such as interframe gaps (IFGs) and preambles are also transmitted. If jumbo frames are used to transmit the data packet, fewer frames, as well as fewer IFGs and preambles, are transmitted, improving bandwidth efficiency.

Setting the jumbo frame length to the maximum value may not be the optimal choice. When a jumbo frame is transmitted on a network, the jumbo frame length must be supported by all devices on the transmission path. Otherwise, the jumbo frame will be discarded during transmission.

S5735-S, S5735S-S, S5735-S-I, S5735-L, S5735S-L, and S5735S-L-M do not support the configuration of the jumbo frame length allowed on an interfaces, and the maximum frame length allowed by interfaces is 10240 bytes.