How often does a host issue IGMP Host Membership Reports for group 224.0.0.1?

The multicast address 224.0.0.1 is the reserved "All Systems" address on the local subnet. According to the Internet Group Management Protocol (IGMP) standards (RFC 1112, RFC 2236, and RFC 3376), all multicast-capable hosts are permanent members of this group on every network interface. This membership is implicit and is explicitly excluded from the reporting mechanism. The protocol standards state that a Membership Report message is never sent for the all-systems-multicast address (224.0.0.1).

B, C, D, E: These options suggest a periodic report, which is incorrect as reports for the 224.0.0.1 group are never sent. F: While hosts send reports for other groups in response to queries, the 224.0.0.1 group is a specific exception and is never reported.

1. IETF RFC 2236, "Internet Group Management Protocol, Version 2": Section 2, "Protocol Description," states, "The all-hosts group (224.0.0.1) is a special group that all multicast-capable hosts must join on every network interface, but membership in this group is never reported."

2. IETF RFC 3376, "Internet Group Management Protocol, Version 3": Section 4.2.12, "Sending Membership Reports," explicitly states, "A Membership Report message is never sent for the all-systems-multicast address (224.0.0.1)."

3. Nokia 7750 SR OS R21.10.R1 Multicast Routing Protocols Guide: In the "IGMP" chapter, the "IGMP Overview" section describes protocol behavior consistent with IETF standards, noting that well-known addresses like 224.0.0.1 have special handling and are not subject to normal join/report mechanisms. (Document ID: 3HE 17279 AAAB TQZZA, Edition 01).