9-3
GARP message format
Figure 9-1 GARP message format
Figure 9-1 illustrates the GARP message format. Table 9-1 describes the GARP message fields.
Table 9-1 Description on the GARP message fields
Field Description Value
Protocol ID Protocol identifier for GARP
1
Message
One or multiple messages, each
containing an attribute type and an
attribute list
––
Attribute Type
Defined by the concerned GARP
application
0x01 for GVRP, indicating the
VLAN ID attribute
Attribute List
Contains one or multiple attributes
––
Attribute
Consists of an Attribute Length, an
Attribute Event, and an Attribute Value
––
Attribute Length
Number of octets occupied by an attribute,
inclusive of the attribute length field
2 to 255 (in bytes)
Attribute Event Event described by the attribute
z 0: LeaveAll event
z 1: JoinEmpty event
z 2: JoinIn event
z 3: LeaveEmpty event
z 4: LeaveIn event
z 5: Empty event
Attribute Value Attribute value
VLAN ID for GVRP
If the Attribute Event is
LeaveAll, Attribute Value is
omitted.
End Mark Indicates the end of a GARP PDU
0x00
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