Specifications

IGMP Configuration Summary
Enabling / Disabling IGMP
9-2 SecureStack B2 Configuration Guide
The purpose of IP multicast group management is to optimize a switched network’s performance
so multicast packets will only be forwarded to those ports containing multicast group hosts or
multicast switch devices instead of flooding to all ports in the subnet (VLAN).
9.2 IGMP CONFIGURATION SUMMARY
Multicasting is used to support real-time applications such as video conferences 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 hosts that want to receive the multicast register with
their local multicast switch. Although this approach reduces the network overhead required by a
multicast server, the broadcast traffic must be carefully pruned at every multicast switch it passes
through to ensure that traffic is only passed to the hosts that subscribed to this service.
9.3 PROCESS OVERVIEW: IGMP CONFIGURATION
Use the following steps as a guide in the IGMP configuration process:
1. Enabling / disabling IGMP (Section 9.4.1)
2. Configuring IGMP (Section 9.4.2)
9.4 IGMP CONFIGURATION COMMAND SET
9.4.1 Enabling / Disabling IGMP
Purpose
To display IGMP information and to enable or disable IGMP snooping on the device.
Commands
The commands used to display, enable and disable IGMP are listed below and described in the
associated sections as shown.
• show igmpsnooping (Section 9.4.1.1)
• set igmpsnooping adminmode (Section 9.4.1.2)
• set igmpsnooping interfacemode (Section 9.4.1.3)