{
  "id": "networking/igmp-report-suppression",
  "signature": "IGMP: report suppression on port Gi0/1, ignoring membership report for 239.0.0.1",
  "signature_zh": "IGMP：端口Gi0/1报告抑制，忽略239.0.0.1的组成员报告",
  "regex": "IGMP: report suppression on port \\S+, ignoring membership report for \\d+\\.\\d+\\.\\d+\\.\\d+",
  "domain": "networking",
  "category": "protocol_error",
  "subcategory": null,
  "root_cause": "An IGMP snooping switch suppresses duplicate membership reports from the same source within a query interval, causing multicast traffic loss if the only reporter is suppressed without a backup querier.",
  "root_cause_type": "generic",
  "root_cause_zh": "IGMP监听交换机在同一查询间隔内抑制来自同一源的重复组成员报告，如果唯一报告者被抑制且无备份查询器，则导致多播流量丢失。",
  "versions": [
    {
      "version": "Cisco IOS XE 16.9.5",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Cisco IOS XE 17.3.3",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Juniper Junos 21.4R1",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Disabling snooping floods all multicast traffic to all ports, wasting bandwidth and potentially overwhelming receivers.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Longer intervals delay group join/leave detection, causing prolonged traffic blackouts after topology changes.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "The switch still suppresses if the report matches an existing group state; manual injection does not reset the suppression timer.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Configure IGMP querier on a different router or enable IGMP proxy reporting to ensure at least one report is forwarded: `ip igmp snooping querier` and `ip igmp snooping proxy-reporting`.",
      "success_rate": 0.75,
      "how": "Configure IGMP querier on a different router or enable IGMP proxy reporting to ensure at least one report is forwarded: `ip igmp snooping querier` and `ip igmp snooping proxy-reporting`.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Set the IGMP robustness variable to 2 or higher on the querier to allow for lost reports: `ip igmp robustness-variable 2`.",
      "success_rate": 0.8,
      "how": "Set the IGMP robustness variable to 2 or higher on the querier to allow for lost reports: `ip igmp robustness-variable 2`.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Use static IGMP group membership on the switch port for critical multicast streams: `ip igmp snooping static-group 239.0.0.1 vlan 100 interface Gi0/1`.",
      "success_rate": 0.95,
      "how": "Use static IGMP group membership on the switch port for critical multicast streams: `ip igmp snooping static-group 239.0.0.1 vlan 100 interface Gi0/1`.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Configure IGMP querier on a different router or enable IGMP proxy reporting to ensure at least one report is forwarded: `ip igmp snooping querier` and `ip igmp snooping proxy-reporting`.",
    "Set the IGMP robustness variable to 2 or higher on the querier to allow for lost reports: `ip igmp robustness-variable 2`.",
    "Use static IGMP group membership on the switch port for critical multicast streams: `ip igmp snooping static-group 239.0.0.1 vlan 100 interface Gi0/1`."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-9/configuration_guide/mcast/b_169_mcast_9300_cg/m_igmp_snooping.html",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.83,
  "fix_success_rate": 0.78,
  "resolvable": "partial",
  "first_seen": "2023-06-15",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}