1-3
Figure 1-1 Format of GARP packets
The following table describes the fields of a GARP packet.
Table 1-1 Description of GARP packet fields
Field Description Value
Protocol ID Protocol ID 1
Message
Each message consists of two parts:
Attribute Type and Attribute List.
—
Attribute Type
Defined by the specific GARP
application
The attribute type of GVRP is 0x01.
Attribute List It contains multiple attributes. —
Attribute
Each general attribute consists of three
parts: Attribute Length, Attribute Event,
and Attribute Value.
Each LeaveAll attribute consists of two
parts: Attribute Length and LeaveAll
Event.
—
Attribute Length The length of the attribute 2 to 255 (in bytes)
Attribute Event The event described by the attribute
0: LeaveAll Event
1: JoinEmpty
2: JoinIn
3: LeaveEmpty
4: LeaveIn
5: Empty
Attribute Value The value of the attribute
For GVRP packets, the value of this field
is the VLAN ID; however, for LeaveAll
messages, this field is invalid.
End Mark End mark of an GARP PDU The value of this field is fixed to 0x00.
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