3Com 4200G 12-Port Configuration Manual page 76

62 C 13: GVRP C
HAPTER
GVRP Packet Format
ONFIGURATION
Leave timer, and unregisters the attribute information if it does not receives a Join
message again before the timer times out.
LeaveAll: Once a GARP entity starts up, it starts the LeaveAll timer, and sends out a
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LeaveALL message after the timer times out, so that other GARP entities can
re-register all the attribute information on this entity. After that, the entity restarts
the LeaveAll timer to begin a new cycle.
GVRP port registration mode
GVRP has the following port registration modes:
Normal: In this mode, both dynamic and manual creation, registration and
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unregistration of VLANs are allowed.
Fixed: In this mode, when you create a static VLAN on a switch and the packets of
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this VLAN are allowed to pass through the current port, the switch joins the
current port to this VLAN and adds a VLAN entry to the local GVRP database (a
table maintained by GVRP). But GVRP cannot learn dynamic VLAN through this
port, and the dynamic VLANs learned through other ports on this switch cannot
be pronounced through this port.
Forbidden: In this mode, all the VLANs except VLAN 1 are unregistered on the
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port, and no other VLANs can be created or registered on the port.
GARP operation procedure
Through the mechanism of GARP, the configuration information on a GARP member
will be propagated to the whole switched network. A GARP can be a terminal
workstation or a bridge; it instructs other GARP member to register/unregister its
attribute information by declaration/recant, and register/unregister other GARP
member's attribute information according to other member's declaration/recant.
The protocol packets of GARP entity use specific multicast MAC addresses as their
destination MAC addresses. When receiving these packets, the switch distinguishes
them by their destination MAC addresses and delivers them to different GARP
application (for example, GVRP) for further processing.
The GVRP packets are in the following format:
Figure 23 Format of GVRP packets