3com S7906E Instruccion De Instalación
1-1
1
IGMP Snooping Configuration
When configuring IGMP snooping, go to the following sections for information you are interested in:
z
z
z
z
z
The S7900E Series Ethernet Switches are distributed devices that support Intelligent Resilient
Framework (IRF). Two S7900E series can be connected together to form a distributed IRF device. If an
S7900E series is not in any IRF, it operates as a distributed device; if the S7900E series is in an IRF, it
operates as a distributed IRF device. For introduction of IRF, refer to IRF Configuration in the System
Volume.
IGMP Snooping Overview
Internet Group Management Protocol Snooping (IGMP snooping) is a multicast constraining
mechanism that runs on Layer 2 devices to manage and control multicast groups.
Principle of IGMP Snooping
By analyzing received IGMP messages, a Layer 2 device running IGMP snooping establishes
mappings between ports and multicast MAC addresses and forwards multicast data based on these
mappings.
As shown in
, when IGMP snooping is not running on the switch, multicast packets are
flooded to all devices at Layer 2. When IGMP snooping is running on the switch, multicast packets for
known multicast groups are multicast to the receivers, rather than broadcast to all hosts, at Layer 2.