Publication date: Sept, 2015
Revision A1
118
2-‐11 IPMC
ICMP is an acronym for Internet Control Message Protocol. It is a protocol that generates the error
response, diagnostic, or routing purposes. ICMP messages generally contain information about
routing difficulties or simple exchanges such as time-‐stamp or echo transactions.
2-‐11.1 IGMP Snooping
The function is used to enable the multicast groups to forward the multicast packet to the member
ports, and avoids wasting the bandwidth while IP multicast packets are running over the network.
This is because a switch that does not support IGMP or IGMP Snooping cannot tell a multicast packet
from a broadcast packet, so it can only treat them all as broadcast packets. Without IGMP Snooping,
the multicast packet forwarding function works the same as it does for a broadcast packet.
A switch supported IGMP Snooping with the functions of query, report, and leave, a type of packet
exchanged between IP Multicast Router/Switch and IP Multicast Host, can update the information of
the Multicast table when a member (port) joins or leaves an IP Multicast Destination Address. With
this function, once a switch receives an IP multicast packet, it will forward the packet to the members
who joined a specified IP multicast group before.
The packets will be discarded by IGMP Snooping if the user transmits multicast packets to the
multicast group that had not been built up in advance. IGMP mode enables the switch to issue the
IGMP function that you enable IGMP proxy or snooping on the switch, which connects to a router
closer to the root of the tree. This interface is the upstream interface. The router on the upstream
interface should be running IGMP.
2-‐11.1.1 Basic Configuration
The section describes how to set the basic IGMP snooping on the switch, which connects to a router
closer to the root of the tree. This interface is the upstream interface. The router on the upstream
interface should be running IGMP.
Web Interface
To configure the IGMP Snooping parameters in the web interface:
1.
Click Configuration, IPMC, IGMP Snooping, Basic Configuration.
2.
Select enable or disable for a Global configuration.
3.
Select which port will be a Router Port or enable/disable the Fast Leave function..
4.
Scroll to set the Throttling parameter.
5.
Click Apply to save the setting.
6.
To cancel the setting, click the Reset button. It will revert to previously saved values.
Figure 2-‐12.1.1: The IGMP Snooping Configuration.
Summary of Contents for LPB2910A
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