Interlogix GE-DSSG-244-POE User Manual - Manual (Page 131)

IFS NS3601-24P/4S GE-DSSG-244 and 244-POE User Manual
129
The page includes the following fields:
Object Description
•
Port
The switch port number of the logical RSTP port.
•
RSTP
The number of RSTP Configuration BPDU's received/transmitted on the port.
•
STP
The number of legacy STP Configuration BPDU's received/transmitted on the
port.
•
TCN
The number of (legacy) Topology Change Notification BPDU's
received/transmitted on the port.
•
Discarded Unknown The number of unknown Spanning Tree BPDU's received (and discarded) on the
port.
• Discarded Illegal The number of illegal Spanning Tree BPDU's received (and discarded) on the
port.
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Multicast
IGMP Snooping
The Internet Group Management Protocol (IGMP) lets host and routers share information about multicast groups memberships.
IGMP snooping is a switch feature that monitors the exchange of IGMP messages and copies them to the CPU for feature
processing. The overall purpose of IGMP Snooping is to limit the forwarding of multicast frames to only ports that are a member of
the multicast group.
About the Internet Group Management Protocol (IGMP) Snooping
Computers and network devices that want to receive multicast transmissions need to inform nearby routers that they will become
members of a multicast group. The Internet Group Management Protocol (IGMP) is used to communicate this information. IGMP
is also used to periodically check the multicast group for members that are no longer active. In the case where there is more than
one multicast router on a sub network, one router is elected as the ‘queried’. This router then keeps track of the membership of the
multicast groups that have active members. The information received from IGMP is then used to determine if multicast packets
should be forwarded to a given sub network or not. The router can check, using IGMP, to see if there is at least one member of a
multicast group on a given subnet work. If there are no members on a sub network, packets will not be forwarded to that sub
network.