Packet length exceeds the MTU

DDSN · Created Sep 16, 2021 09:19:38

Hi hemin88,
The CE series switch functions as the VXLAN gateway to encapsulate the VXLAN header into 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 network device.

You can use one of the following methods or a combination of them based on the functions supported by the underlay network device:

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.

Configure the MTU of the underlay network device so that the MTU is larger than the length of VXLAN packets.

Deploy the VXLAN gateway on the device that supports packet fragmentation and reassembly. Then the device fragments and reassembles VXLAN packets so that VXLAN packets can be forwarded on the underlay network.

DDSN · Created Sep 16, 2021 09:08:04

Hi hemin88,
Please wait patiently. Our engineers are looking for answers to your questions.

BAZ · Created Sep 16, 2021 09:17:41

The CE series switch functions as the VXLAN gateway to encapsulate the VXLAN header into 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 network 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 that supports packet fragmentation and reassembly. Then the device fragments and reassembles VXLAN packets so that VXLAN packets can be forwarded on the underlay network

https://support.huawei.com/enterprise/es/doc/EDOC1000060766/306b320c/what-can-i-do-if-the-length-of-the-packet-encapsulated-with-the-vxlan-header-exceeds-the-mtu-of-the-underlay-network-device

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DDSN · Created Sep 16, 2021 09:19:38

Hi hemin88,
The CE series switch functions as the VXLAN gateway to encapsulate the VXLAN header into 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 network device.

You can use one of the following methods or a combination of them based on the functions supported by the underlay network device:

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.

Configure the MTU of the underlay network device so that the MTU is larger than the length of VXLAN packets.

Deploy the VXLAN gateway on the device that supports packet fragmentation and reassembly. Then the device fragments and reassembles VXLAN packets so that VXLAN packets can be forwarded on the underlay network.

Packet length exceeds the MTU

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Packet length exceeds the MTU

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