3com S7906E Manuel De Montage

 

1-3 

Figure 1-1 GARP message format 

 

 

 describes the GARP message fields.  

Table 1-1 Description on the GARP message fields 

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  

0: LeaveAll event 

1: JoinEmpty event 

2: JoinIn event 

3: LeaveEmpty event 

4: LeaveIn event 

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