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AR500, AR510, and AR530 V200R007 CLI-based Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring transparent bridge, MAC table, link aggregation, VLANs, STP/RSTP/MSTP, and so on.The document provides the configuration procedures and configuration examples to illustrate the service configuration methods and application scenario.
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Packet Structure

Packet Structure

GARP packets are encapsulated in the IEEE 802.3 Ethernet format, as shown in Figure 10-4.

Figure 10-4  GARP packet structure

The following table describes the fields in a GARP packet.




Protocol ID

Indicates the protocol ID.

The value is 1.


Indicates the messages in the packet. Each message consists of the Attribute Type and Attribute list fields.


Attribute Type

Indicates the type of an attribute, which is defined by the GARP application.

The value is 0x01 for GVRP, indicating that the attribute value is a VLAN ID

Attribute List

Indicates the attribute list of a message, which consists of multiple attributes.



Indicates an attribute, which consists of the Attribute Length, Attribute Event, and Attribute Value fields.


Attribute Length

Indicates the length of an attribute.

The value ranges from 2 to 255, in bytes.

Attribute Event

Indicates the event that an attribute describes.

The value can be:
  • 0: LeaveAll Event

  • 1: JoinEmpty Event

  • 2: JoinIn Event

  • 3: LeaveEmpty Event

  • 4: LeaveIn Event

  • 5: Empty Event

Attribute Value

Indicates the value of an attribute.

The value is a VLAN ID for GVRP. This field is invalid in a LeaveAll attribute.

End Mark

Indicates the end of a GARP PDU.

The value is 0x00.

Updated: 2019-05-25

Document ID: EDOC1000097279

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