Differences between the MTU and frame length

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Maximum transmission unit (MTU) refers to the length of a Layer 3 packet, that is, the length of an IP data packet.
Frame length refers to the length of a Layer 2 Ethernet frame.
The right figure uses a standard Ethernet frame to compare the MTU and frame length.

Other related questions:
How to set the length of a Jumbo frame
The procedure for setting the length of a Jumbo frame is described on the right.

What is the performance difference between the MRS board and MTU board of the U1900?
For details, see General Information > Product Description > Technical Specifications > Performance and Capacity in the product documentation .

Differences between the data frames of 10GE LAN and data frames of 10GE WAN services supported on the OSN 6800
10GE LAN services use Ethernet data frames, while 10GE WAN services use SDH data frames.

How to solve the problem if the length of a packet encapsulated with the VXLAN header exceeds the MTU of an underlay network device
A CE series switch functions as the VXLAN gateway and adds VXLAN headers to data packets that enter the VXLAN tunnel. After VXLAN encapsulation, the encapsulated packets have 54 bytes more than original data packets. The length of encapsulated packets may exceed the MTU of the underlay network device. As a result, packets are discarded by the device. You can use one of the following methods or a combination of them based on the functions supported by the underlay network device: 1. Configure the maximum length of Jumbo frames allowed by the underlay network device so that the maximum length of Jumbo frames is larger than the length of VXLAN packets. 2. Configure the MTU of the underlay network device so that the MTU is larger than the length of VXLAN packets. 3. Deploy the VXLAN gateway on the device such as the CE6880EI that supports packet fragmentation and reassembly. The device then fragments and reassembles VXLAN packets so that VXLAN packets can be forwarded on the underlay network.

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