202
SIGNAMAX LLC • www.signamax.eu
MAC address is
0100.5E00.010C.
01:18:43: L2 static multicast entry (2, 0100.5E00.010C) deleted
01:18:43: L2 static multicast entries sum decreased to 0
The static
multicast item (2,
0100.5E00.010C) is
deleted successfully.
IGMP Snooping
This section describes how to configure IGMP Snooping, including the basic configuration
commands and debugging commands.
The contents of this section are as follows:
•
Introduction
•
Basic commands
•
Application examples
•
Monitoring and debugging
Introduction
IGMP Snooping is a protocol designed for the switches that do not support IGMP to reduce the
spreading scope of multicast packets and prevent multicast packets from being spread to the
network segments that do not need the multicast packets.
It forms and maintains downstream port list of each multicast group at the local via
monitoring IGMP packets. In this way, only the multicast packets of the specified group are
sent to the downstream port of the multicast group when the multicast packets are received.
Besides, IGMP Snooping is responsible for forwarding IGMP packets.
IGMP Snooping has close relationship with IGMP. Originally, IGMP Snooping is used to maintain
multicast group information when IGMP does not run, but we permit the two protocols to co-
exist. When the two protocols co-exist, IGMP Snooping does not maintain the multicast group
information and IGMP is responsible for maintaining the multicast group information, but IGMP
Snooping forwards the received packets according to the packet type.
IGMP Snooping has the following functions:
1.
Monitor IGMP packets to set up multicast information. GMP Snooping gets the multicast
information by monitoring IGMP packets and decides which ports on the switch can be
added to a multicast group and which networks connected to the network has the
switch supporting the IGMP protocol.
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