3com 5500-SI Manual De Usuario

Introduction to GVRP 113

The GVRP packets are in the following format:

Figure 26   Format of GVRP packets

Table 102 describes the packet fields in Figure 26.

GVRP is defined in IEEE 802.1Q standard.

Protocol ID

Protocol ID

1

Message

Each message consists of two parts: 
Attribute Type and Attribute List.

-

Attribute Type

It is defined by 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

Attribute Event

The event described by the attribute

0: LeaveAll Event1: JoinEmpty 2: 
JoinIn3: LeaveEmpty4: LeaveIn5: 
Empty

Attribute Value

The value of the attribute

The attribute value of GVRP is 
the VID.

End Mark

End mark of the GVRP PDU.

-