 IGMP Snooping (Internet Group Management Protocol Snooping) is a network switch technology used to intelligently manage the transmission of multicast data based on the actual needs of receivers (hosts or routers) during multicast communication.  IGMP Snooping listens to IGMP messages on the network to understand which devices are interested in specific multicast groups and makes decisions on which ports to forward multicast data based on this information.

IGMP Snooping Configuration

 MLD Snooping (Multicast Listener Discovery Snooping) is an IPv6 Layer 2 multicast protocol.  In an IPv6 network, to avoid wasting bandwidth by broadcasting multicast packets within a local area network (LAN), MLD Snooping can be deployed in the Layer 2 network to achieve precise forwarding of multicast packets.

MLD Snooping Configuration

 When users in different VLANs have the same multicast data requirements, the upstream router needs to send multiple copies of the same multicast packet, each carrying a different VLAN, to different VLANs.  With multicast VLAN functionality deployed on Layer 2 devices, the upstream router no longer needs to replicate the multicast stream in each user VLAN.

Multicast VLAN Configuration

 IGMPv3 enhances host control capabilities while maintaining backward compatibility with IGMPv1 and IGMPv2.  It enables hosts to explicitly specify whether to accept or reject multicast traffic from particular sources (S) when joining a multicast group (G).

IGMPv3 Configuration

 In an IGMP-enabled multicast network, devices can assume one of two roles within a network segment Querier Responsible for sending Query messages Receives and processes Host Membership Reports (join messages) and Leave Group messages from hosts Maintains awareness of which multicast groups have active receivers (group members) on the segment connected to its interface Determines when group members leave by monitoring responses to its queries Non-Querier Passively receives Host Membership Reports from hosts Tracks which multicast groups have active receivers on its connected segment Relies on the Querier's activity to determine when group members leave Does not initiate queries itself A network segment can have only one querier, so multicast devices must elect the querier through a selection process.  The election rules are as follows After enabling the querier function, multicast Device A will default to being the querier for the current network segment during the IGMP protocol startup phase and begin sending query messages to the segment.

Querier Configuration

Policy Route Configuration

IP Multicast Configuration

delete-span-style

Enterprise & Campus Network

Preface

Applicable Hardware Models

Basic Configuration

Ethernet Interface Configuration

VLAN Configuration

MAC Address Table Configuration

QinQ Configuration

MSTP Configuration

Ethernet Link Aggregation Configuration

L2PT Configuration

Ethernet Switching Configuration

DHCP Server Configuration

DHCP  Relay Configuration

DHCP Snooping Configuration

ND Snooping Configuration

IP Service Configuration

ACL Configuration

ARP Attack Detection Configuration

IPSG Configuration

SAVI Configuration

RA Guard Configuration

Security Configuration

QoS Configuration

Traffic Mirroring Configuration

SNMP Configuration

Network Management and Monitoring Configuration

AAA Configuration

Configuration Guide

Device Management

Interface Management

MAC Configuration

Interface Isolation Group Configuration

LLDP Configuration

Link Aggregation Configuration

STP Configuration

Loopback Detection Configuration

Ethernet Switching

IPv4 Configuration

ARP Configuration

DHCP Relay Configuration

IPv6 Configuration

IP Service

IP Multicast

Reliability Configuration

ARP Detection Configuration

IPv6 RA Guard Configuration

User Binding Rule Configuration

Traffic Suppression And Storm Control Configuration

Copp Speed limit

Port Security

Syslog Configuration

SFLOW Configuration

Mirror Configuration

Network Management And Monitoring

Command Line Reference