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S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Packet Format

Packet Format

GARP packets are encapsulated in the IEEE 802.3 Ethernet format, as shown in Figure 12-4.

Figure 12-4  GARP packet format

The following table describes the fields in a GARP packet.

Field

Description

Value

Protocol ID

Indicates the protocol ID.

1

Message

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

-

Attribute Type

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

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.

2 to 255, in bytes

Attribute Event

Indicates the 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

Indicates the value of an attribute.

VLAN ID for GVRP

This field is invalid in a LeaveAll attribute.

End Mark

Indicates the end of a GARP PDU.

0x00

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Updated: 2019-08-21

Document ID: EDOC1000142081

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