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H3C Technologies H3C S3100 Series Switches User Manual

Page 134

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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.