![]() ![]() The composition means that the data field can contain 1500 bytes to the maximum. An Ethernet frame contains a 14-byte frame header (6-byte DMAC + 6-byte SMAC + 2-byte Type), a 4-byte CRC checksum, or FCS, and a data field. The maximum length of an Ethernet II frame is 1518 bytes. Data frames longer than 1518 bytes are called giant frames generated due to line interference or abnormal operating of an Ethernet interface. Note: Data frames shorter than 64 bytes are fragments generated due to an Ethernet conflict, line interference, or abnormal operating of an Ethernet interface. ![]() ![]() Ethernet frames that are shorter than 64 bytes or longer than 1518 bytes are considered as error frames and are discarded by Ethernet forwarding devices. If the network access is low in a PPPoE scenario, check the MTU and TCP MSS values of the device.īefore locating the fault, familiarize yourself with the following concepts:Īn Ethernet II frame is formed by the DMAC+SMAC+Type+Data+CRC.ĭue to the transmission limitation of Ethernet, each Ethernet frame can contain 64 bytes to 1518 bytes. ![]()
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