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CLI-based Configuration Guide - Ethernet Switching

AR650, AR1600, and AR6100 V300R003

This document describes how to configure the components for LAN services, including link aggregation groups, VLANs, voice VLANs, MAC address tables, transparent bridging, as well as GVRP, STP/RSTP, and MSTP protocols.
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Packet Structure

Packet Structure

GARP packets are encapsulated in the IEEE 802.3 Ethernet format, as shown in Figure 9-4.

Figure 9-4  GARP packet structure

The following table describes the fields in a GARP packet.

Field

Description

Value

Protocol ID

Indicates the protocol ID.

The value is 1.

Message

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.

-

Attribute

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.

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Updated: 2019-04-12

Document ID: EDOC1100041791

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