HP Hub & Switch Management for OV-UX - Manual (Page 61)

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Managing Switches
Configuration
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switch then sends the packet to the ports with members of the destination
multicast group.
Special multicast routers/queriers communicate by using three message
types - query, report, and leave group. The query message, sent by a querier,
is used to discover which network interfaces belong to a multicast group.
Each host responds to the query message with a report message that tells the
querier the host is a member of the multicast group. The host also can send a
report message to join a group or a leave message to leave a group.
Note: Using the console you can designate specific ports to always or
never forward multicast packets.
Forward with High Priority
When “Forward with High Priority” is checked, any IGMP packets received
by the switch will be forwarded in a prioritized manner, preceding packets
with normal priority.
The Spanning Tree Protocol
The Spanning Tree Protocol (IEEE 802.1d) maintains a loop-free topology in
networks with redundant bridges or switches. The spanning tree devices
determine which devices will be active and which will be backups so that no
two nodes in a network have more than one active path between them at any
time. The Spanning Tree Protocol uses the most efficient path between
segments. If a bridge or switch fails, the other bridges and switches
reconfigure the network automatically. When the problem is repaired, the
bridges and switches automatically return to the original network
configuration.