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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

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.




Protocol ID

Indicates the protocol ID.



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.



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.


This field is invalid in a LeaveAll attribute.

End Mark

Indicates the end of a GARP PDU.


Updated: 2019-10-18

Document ID: EDOC1000178310

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