Packet Format

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Packet Format

GVRP is an application of GARP, and the GVRP packet format complies with GARP.

GARP packets are encapsulated in the IEEE 802.3 Ethernet format, as shown in Figure 8-2.

Figure 8-2 GARP packet format

The following table describes the fields in a GARP packet.

Field	Description
Protocol ID	Protocol ID. The value is 1.
Message	Message in a packet. A message consists of the Attribute Type and Attribute List fields.
Attribute Type	Attribute type, which is defined by the GARP application. The value is 0x01 for GVRP, indicating that the attribute value is a VLAN ID.
Attribute List	Attribute list, containing multiple attributes.
Attribute	Attribute, which consists of the Attribute Length, Attribute Event, and Attribute Value fields.
Attribute Length	Length of an attribute. The value is 2 to 255, in bytes.
Attribute Event	Event that an attribute describes: 0: LeaveAll Event 1: JoinEmpty Event 2: JoinIn Event 3: LeaveEmpty Event 4: LeaveIn Event 5: Empty Event
Attribute Value	Value of an attribute, which is a VLAN ID for GVRP but is invalid for a LeaveAll attribute.
End Mark	End of a GARP PDU. The value is 0x00.

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, M-LAG, VLAN, QinQ, VLAN mapping, GVRP, STP/RSTP, MSTP, VBST, ERPS (G.8032), LBDT, and Layer 2 protocol transparent transmission.