{
  "id": "networking/ethernet-jumbo-frame-mtu-exceeded",
  "signature": "Ethernet: jumbo frame size 9600 bytes exceeds interface MTU 1500 on eth0, packet dropped",
  "signature_zh": "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",
  "regex": "Ethernet: jumbo frame size \\d+ bytes exceeds interface MTU \\d+ on \\S+, packet dropped",
  "domain": "networking",
  "category": "network_error",
  "subcategory": null,
  "root_cause": "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.",
  "root_cause_type": "generic",
  "root_cause_zh": "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。",
  "versions": [
    {
      "version": "Linux kernel 6.1.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Cisco IOS 15.2(7)E",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Mellanox ConnectX-5 firmware 16.32.1016",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Jumbo frames are Layer 2 constructs; IP fragmentation applies to Layer 3 and cannot split an Ethernet frame.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Application buffers do not control frame size; the NIC driver segments data into MTU-sized frames.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "An MTU of 0 is invalid and causes the interface to fail to transmit any packets.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "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.",
      "success_rate": 0.95,
      "how": "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.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Ensure all devices in the path support jumbo frames by checking with `ping -M do -s 8972 <destination>` (Linux) to test large packet delivery.",
      "success_rate": 0.85,
      "how": "Ensure all devices in the path support jumbo frames by checking with `ping -M do -s 8972 <destination>` (Linux) to test large packet delivery.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Segment the network so jumbo frames are only used in dedicated storage or backup VLANs with consistent MTU settings.",
      "success_rate": 0.8,
      "how": "Segment the network so jumbo frames are only used in dedicated storage or backup VLANs with consistent MTU settings.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "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.",
    "Ensure all devices in the path support jumbo frames by checking with `ping -M do -s 8972 <destination>` (Linux) to test large packet delivery.",
    "Segment the network so jumbo frames are only used in dedicated storage or backup VLANs with consistent MTU settings."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/29805-175.html",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.82,
  "fix_success_rate": 0.76,
  "resolvable": "true",
  "first_seen": "2024-01-10",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}