Is IGMP Layer 2 Or Layer 3?

How does IGMPv3 address the weaknesses of IGMPv1 and IGMPv2?

One weakness of IGMPv2 is the host’s inability to specify which source is allowed to send the multicast traffic.

IGMPv3 solves this problem by allowing the multicast receiver to specify specific sources when joining a group..

What does multicast mean?

In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused with physical layer point-to-multipoint communication.

How do I set up IGMP querier?

To run the IGMP Snooping querier on a VLAN, you have to enable it globally and on the VLAN. To enable IGMP snooping on a specific VLAN, use the ip igmp snooping vlan enable command in switch configuration mode. To return to the default, use the no form of this command. IGMP snooping can be enabled only on static VLANs.

How does IGMP snooping work?

IGMP snooping allows us to constrain our multicast traffic. As the name implies, this is done by listening to IGMP traffic between the router and hosts: When the host sends a membership report for a multicast group then the switch adds an entry in the CAM table for the interface that is connected to the host.

What is the difference between IGMP v2 and v3?

IGMPv2 improves over IGMPv1 by adding the ability for a host to signal desire to leave a multicast group and IGMPv3 improves over IGMPv2 mainly by adding the ability to listen to multicast originating from a set of source IP addresses only.

What is IGMP version?

IGMP is a network layer (Layer 3) protocol used to establish membership in a Multicast group and can register a router to receive specific Multicast traffic. (Refer to RFC 1112 and RFC 2236 for information on IGMP versions 1 and 2.)

What is the purpose of IGMP?

Internet Group Management Protocol (IGMP; Defined in RFC 1112 ) is a protocol that allows a host to advertise its multicast group membership to neighboring switches and routers. IGMP is a standard protocol used by the TCP/IP protocol suite to achieve dynamic multicasting.

Is IGMP snooping enabled by default?

Scenario with Multicast Router The two switches have IGMP snooping enabled by default and we are using default VLAN 1.

What is multicast traffic?

IP multicast is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission. It is the IP-specific form of multicast and is used for streaming media and other network applications. … IGMP snooping is used to manage IP multicast traffic on layer-2 networks.

Should I enable 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 happens if IGMP snooping is disabled?

IGMP Snooping will not help with any of the wifi performance issue. It will in fact be wasted resources for your router to listen or monitor for nonexistent type of traffic on your wifi setup.

Does Netflix use multicast?

Since multicast is so much more efficient than unicast, large companies like Netflix and Youtube must be using this to stream videos right? Unfortunately multicast on the Internet has never really been implemented. These large video companies use LOTS of unicast traffic to deliver videos to their customers.

How does multicast IP work?

Using multicast, a source can send a single copy of data to a single multicast address, which is then distributed to an entire group of recipients. A multicast group identifies a set of recipients that are interested in a particular data stream, and is represented by an IP address from a well-defined range.

What is IGMP snooping and why would I need it?

IGMP snooping is designed to prevent hosts on a local network from receiving traffic for a multicast group they have not explicitly joined. It provides switches with a mechanism to prune multicast traffic from links that do not contain a multicast listener (an IGMP client).

How do I know if IGMP snooping is working?

Step 1: Select test modules and ports. … Step 2: Ensure that IGMP snooping is disabled on the DUT.Step 3: Enable IGMP emulation on the first destination test port. … Step 4: Transmit multicast traffic from the source tester port. … Step 5: Verify that the traffic is received on both of the destination tester ports.More items…