H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – VLAN
H3C S7500E Series Ethernet Switches Chapter 4 GVRP Configuration
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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 4-1 GARP message format
Table 4-1 describes the GARP message fields.
Table 4-1 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)