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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.