networking network_error ai_generated true

以太网：巨型帧大小9600字节超过接口eth0的MTU 1500，数据包被丢弃

Ethernet: jumbo frame size 9600 bytes exceeds interface MTU 1500 on eth0, packet dropped

ID: networking/ethernet-jumbo-frame-mtu-exceeded

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76%修复率
82%置信度
1证据数
2024-01-10首次发现

版本兼容性

版本状态引入弃用备注
Linux kernel 6.1.0 active — — —
Cisco IOS 15.2(7)E active — — —
Mellanox ConnectX-5 firmware 16.32.1016 active — — —

根因分析

设备试图发送大于接口MTU的巨型帧，导致数据包在数据链路层被丢弃而不进行分片。

English

A device attempted to send a jumbo frame larger than the interface MTU, causing the packet to be dropped at the data link layer without fragmentation.

generic

官方文档

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/29805-175.html

解决方案

  1. Increase the interface MTU to accommodate jumbo frames: `ip link set dev eth0 mtu 9000` on Linux, or `mtu 9000` in interface config on Cisco switches.
  2. Ensure all devices in the path support jumbo frames by checking with `ping -M do -s 8972 <destination>` (Linux) to test large packet delivery.
  3. Segment the network so jumbo frames are only used in dedicated storage or backup VLANs with consistent MTU settings.

无效尝试

常见但无效的做法:

  1. 95% 失败

    Jumbo frames are Layer 2 constructs; IP fragmentation applies to Layer 3 and cannot split an Ethernet frame.

  2. 70% 失败

    Application buffers do not control frame size; the NIC driver segments data into MTU-sized frames.

  3. 90% 失败

    An MTU of 0 is invalid and causes the interface to fail to transmit any packets.