79
Item
Description
Loop Detect State
Enable/Disable Loop Detect function
LDP Interval Time
Specify the interval time of sending loop detection
packets
Block Release Time
Specify the blocked Port and its release time
LDP MAC Destination Address
Specify DA that sends loop detection packets
Loop Detect Port Enabled
Select Port with Loop Detect function enabled
Refresh
Refresh Loop Detect status
IV-7-6
GVRP
The GARP VLAN Registration Protocol (GVRP) is used to register and deregister VLAN
attributes through message exchange between each Port. GVRP use messages are Join
messages, Leave messages, and LeaveAll messages.
Join messages: When Switch receives Join messages from other devices or when it is
configured with VLAN statically, it sends Join messages to other devices.
Join messages are classified into JoinEmpty and JoinIn. JoinEmpty declares an
unregistered attribute; JoinIn declares a registered attribute.
Leave messages: When switch receives Leave message from other devices or when some
of its VLAN are deregistered statically, it sends Leave messages to other devices. Leave
messages are classified into LeaveEmpty and LeaveIn. LeaveEmpty deregisters an
unregistered attribute; LeaveIn deregisters a registered attribute.
LeaveAll messages: When the Port enabled GVRP function, LeaveAll timer is also started.
When the LeaveAll timer expires, the participant sends LeaveAll messages to other
devices. LeaveAll deregisters all attributes to delete useless attributes on the network.
GVRP timers are: Join timer, Leave timer and LeaveAll timer.
Join timer: The Join timer controls the sending of Join messages and ensures messages
can be sent to other Switch. Join timer is enabled after Join message is sent. If the JoinIn
message is not received, it sends a second Join message when the Join timer expires.
Leave timer: The Leave timer is used to control the sending of Leave messages. The Leave
timer is started after receiving a Leave or LeaveAll message. If other equipment does not
receive any Join message of the corresponding attribute before the Leave timer expires,
then such attribute is no longer in use and the Switch deregisters the attribute.
LeaveAll timer: When a Port starts GVRP function, it starts the LeaveAll timer. When the
LeaveAll timer expires, the participant sends a LeaveAll message. The LeaveAll timer will
restart after receiving LeaveAll message to prevent generation of unnecessary packets.
