141
Role is Inactive.
Immediate Leave
Enable the fast leave on the port.
2-12 IPMC
ICMP is an acronym for Internet Control Message Protocol. It is a protocol that
generated 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.
2-12.1 IGMP Snooping
The function, is used to establish the multicast groups to forward the multicast packet
to the member ports, and, in nature, 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 the multicast packet from the broadcast packet,
so it can only treat them all as the broadcast packet. Without IGMP Snooping, the
multicast packet forwarding function is plain and nothing is different from 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 in a
specified IP multicast group before.
The packets will be discarded by the 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 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.
2-12.1.1 Basic Configuration
The section describes how to set the basic IGMP snooping on the switch, which
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