3-21
Default Priority Type
This is to decide the default priority of each port.
COS Priority:
This is to map the COS priority (level 0~7) to port priority (4 levels).
TOS Priority:
This is to map the TOS priority (level 0~63) to port priority (4 levels).
IGMP
The IGMP (Internet Group Management Protocol) is an Internet Protocol that provides a way for
an internet device to report its multicast group membership to adjacent routers. Multicasting
allows one computer on the internet to send data to a multitude of other computers that have
identified themselves as being interested in receiving the originating computers data.
Multicasting is useful for such applications as updating the address books of mobile computer
users in the field, sending out newsletters to a distribution list, and broadcasting streaming media
to an audience that has tuned into the event by setting up multicast group membership.
In effect, IGMP manages multicast traffic by making use of switches, routers, and hosts that
support IGMP. Enabling IGMP allows the ports to detect IGMP queries, report packets, and
manage multicast traffic through the switch. IGMP has three fundamental types of messages, as
shown below:
