Wireless Network Manager Administration Guide
- Wireless Network Manager
- Getting Started with Wireless Network Manager
- Overview
- Using Air Marshal
- Managing Your Network
- Managing Policies
- Policy Hierarchy
- Select an AP Policy
- Select a Switch Policy
- General
- System
- Spanning Tree Protocol
- Link Layer Discovery Protocol
- Voice VLAN
- Quality of Service (QoS)
- Internet Group Management Protocol (IGMP) Snooping
- Dynamic Host Configuration Protocol (DHCP) Snooping
- Dynamic Host Configuration Protocol (DHCP) Relay
- Loopback Detection
- Jumbo Frames
- Multicast Filtering
- 802.1X
- Static Route IPV4
- DoS
- Radius Server
- Mirror Settings
- Address Resolution Protocol
- Static MAC Address Table
- SNMP
- Ports
- Port Policy
- Link Aggregation
- VLAN
- Select an SSID
- Select a Security Policy
- AP Policies
- Using Tags to Manage Access Points and SSIDs
- QoS Policies
- Wi-Fi Multimeda (WMM) Profiles
- Managing Switch Policies
- Managing Switch Port Policies
- Security Policies
- Managing SNMP Policies
- Managing Switch SNMP Policies
- Policy Hierarchy
- Objects
- Admin
- SonicWall Support
Internet Group Management Protocol (IGMP) Snooping
Internet Group Management Protocol (IGMP) Snooping allows a Switch to forward multicast traffic intelligently. Multicasting is used to support real-time applications such as videoconferencing or streaming audio. A multicast server does not have to establish a separate connection with each client. It merely broadcasts its service to the network, and any host that wishes to receive the multicast register with their local multicast Switch.
A multicast group is a group of end nodes that want to receive multicast packets from a multicast application. After joining a multicast group, a host node must continue to periodically issue reports to remain a member. Any multicast packets belonging to that multicast group are then forwarded by the Switch from the port.
A Switch supporting IGMP Snooping can passively snoop on IGMP Query, Report, and Leave packets transferred between IP Multicast Switches and IP Multicast hosts to determine the IP Multicast group membership. IGMP Snooping checks IGMP packets passing through the network and configures Multicasting accordingly. Based on the IGMP query and report messages, the Switch forwards traffic only to the ports that request the multicast traffic.
It enables the Switch to forward packets of multicast groups to those ports that have validated host nodes. The Switch can also limit flooding of traffic to IGMP designated ports. This improves network performance by restricting the multicast packets only to Switch ports where host nodes are located. IGMP Snooping significantly reduces overall Multicast traffic passing through your Switch. Without IGMP Snooping, Multicast traffic is treated in the same manner as a Broadcast transmission, which forwards packets to all ports on the network.
To activate the IGMP Snooping
- Navigate to Policies > Policy Hierarchy > Switch Policy.
- Select the System tab and scroll down to the IGMP Snooping section.
- Enable the toggle bar, IGMP Snooping Enable.
- Specify the Report Suppression. The range is from 1 to 25.
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