42
IGMP Snooping (Internet Group Management Protocol)
IGMP Snooping provides a way to route multicast traffic and reduce unwanted traffic. IP multicasting is
commonly used when sending the same information to many receivers. IGMP routes the multicast
traffic to the correct devices and will not broadcast the message to unintended devices. IP multicast
addresses are in the range of 224.0.0.0 through 239.255.255.255.
Enabling IGMP allows the ports to detect IGMP queries, report packets, and manage IP multicast traffic
through the switch. IGMP has three fundamental types of message:
Query
A message sent from the device sending a query (IGMP router or switch) asking for a response from
each host belonging to the multicast group.
Report
A message sent by a host to the device that sent the query, to indicate that the host wants to be, or is a
member of, a given group indicated in the report message.
Leave Group
A message sent by a host to the device that sent the query, to indicate that the host has quit being a
member of a specific multicast group.
IGMP snooping has been expanded, overcoming some limitation of old versions. It works with GMRP by
sending GMRP notifications when PC's change port. This will avoid multicast traffic lose.
Figure 40. IGMP settings
Query Interval
Query interval time (125 - 5000 seconds) between IGMP Query transmissions.
Multicast Age Time
The length of the MAC address will remain in the multicast table. The switch will delete this group and
send leave message.
Содержание B&B SmartWorx ESWGP506-2SFP-T
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Страница 14: ...14 FRONT PANEL Figure 2 Front Panel ...
Страница 37: ...37 Figure 32 Tag Untag VLANs Figure 33 802 1Q VLAN settings ...
Страница 59: ...59 DIMENSIONAL DRAWING Figure 57 Dimensional drawing ...