H3C S5500-SI Series Operation Manual page 31

Operation Manual – VLAN
H3C S5500-SI Series Ethernet Switches
attributes with other participants by making or withdrawing declarations of attributes
and at the same time, based on received declarations or withdrawals, handles
attributes of other participants. When a port receives an attribute declaration, it
registers the attribute; when a port receives an attribute withdrawal, it deregisters the
attribute.
GARP participants send protocol data units (PDU) with a particular multicast MAC
address as destination. Based on this address, a device can identify to which GVRP
application, GVRP for example, should a GARP PDU be delivered.
III. GARP message format
The following figure illustrates the GARP message format.
Figure 3-1 GARP message format
Table 3-1
Table 3-1 Description on the GARP message fields
Protocol ID
Message
Attribute Type
Attribute List
Attribute
describes the GARP message fields.
Field
Protocol identifier for GARP
One or multiple messages,
each containing an attribute
type and an attribute list
Defined by the concerned
GARP application
Contains one or multiple
attributes
Consists of an Attribute Length,
an Attribute Event, and an
Attribute Value
Description
3-3
Chapter 3 GVRP Configuration
Value
1
––
0x01 for GVRP, indicating
the VLAN ID attribute
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