What is IGMPv2 protocol?
The Internet Group Management Protocol (IGMP) is a protocol that allows several devices to share one IP address so they can all receive the same data. IGMP is a network layer protocol used to set up multicasting on networks that use the Internet Protocol version 4 (IPv4).
What are the message types used in IGMP?
IGMP Message Types
| Message Type | Description |
|---|---|
| v1 Membership Report | Identifies this message as an IGMPv1 Membership Report. |
| v2 Membership Report | Identifies this message as an IGMPv2 Membership Report. |
| v2 Leave Report | Used by IGMPv2 hosts to announce that they are leaving a multicast group. |
Should I disable IGMP?
IGMP proxying should be left enabled unless it causes problems. This allows the router to convert Multicast traffic into Unicast traffic, allowing for the network especially wireless devices, to work more efficiently.
What triggers IGMP report messages?
Subsequent IGMP Report messages of group G are triggered by IGMP Query messages sent by Device A. When a host (for example, Host A) leaves a multicast group G, the processing flow is as follows: Host A sends an IGMP Leave message of group G to Device A.
Should I enable IGMP snooping?
For a home based network, you should enable it when you frequently use any kind of streaming or mirroring from your devices to stream to Apple TV or Chromecast. In some brand firmware such as Asus, enabling IGMP Snooping can fix some of the Apple TV Airplay mirroring issues.
Why is IGMP needed?
The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships. IGMP is an integral part of IP multicast and allows the network to direct multicast transmissions only to hosts that have requested them.
Who sends IGMP query?
The master of the IGMP filter lists is the router or switch that is configured to act as the IGMP Querier. The responsibility of the Querier is to send out IGMP group membership queries on a timed interval, to retrieve IGMP membership reports from active members, and to allow updating of the group membership tables.
What does IGMP snooping do?
With IGMP snooping enabled, the device monitors IGMP traffic on the network and uses what it learns to forward multicast traffic to only the downstream interfaces that are connected to interested receivers.
What is the value of an IGMPv2 message?
Type field of IGMPv2 message Message Type Type value number IGMP Membership Query (MQ) messages 0x11 IGMPv2 Membership Report (MR) messages 0x16 IGMPv2 Leave Group (LG) messages 0x17
How does the leave group message work in IGMP?
IGMPv2 introduced a Leave Group message, which is sent by a host when it leaves a multicast group for which it was the last host to send an IGMP Report message. Receipt of this message causes the Querier possibly to reduce the remaining lifetime of its state for the group, and to send a group-specific IGMP Query message to the multicast group.
What is the Class D multicast address in IGMPv2?
Group Address field in IGMPv2 message contains the Class D multicast address of the multicast group. In IGMPv2, multicast clients interested in joining a multicast group generate and send unsolicited Membership Report (MR) messages. IGMPv2 Membership Report (MR) messages are sent to the multicast group address they wanted to join.
When does a host send an IGMP report?
When a host joins a new multicast group on an interface, it immediately sends an unsolicited IGMP Report message for that group. IGMPv2 introduced a Leave Group message, which is sent by a host when it leaves a multicast group for which it was the last host to send an IGMP Report message.
