3Com 4500 PWR 26-Port Configuration Manual page 144

Figure 11-1 Format of GARP packets
The following table describes the fields of a GARP packet.
Table 11-1 Description of GARP packet fields
Field
Protocol ID
Message
Attribute Type
Attribute List
Attribute
Attribute Length
Attribute Event
Attribute Value
End Mark
Description
Protocol ID
Each message consists of two
parts: Attribute Type and
Attribute List.
Defined by the specific GARP
application
It contains multiple attributes.
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.
The length of the attribute
The event described by the
attribute
The value of the attribute
End mark of an GARP PDU
11-3
Value
1
—
The attribute type of GVRP is
0x01.
—
—
2 to 255 (in bytes)
0: LeaveAll Event
1: JoinEmpty
2: JoinIn
3: LeaveEmpty
4: LeaveIn
5: Empty
For GVRP packets, the value of
this field is the VLAN ID;
however, for LeaveAll
messages, this field is invalid.
The value of this field is fixed to
0x00.