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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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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
TPID

TPID

The Tag Protocol Identifier (TPID) specifies the protocol type of a VLAN tag. The TPID value defined in IEEE 802.1Q is 0x8100.

Figure 8-4 shows the Ethernet packet format defined in IEEE 802.1Q. An IEEE 802.1Q tag, containing the TPID, lies between the Source Address field and the Length/Type field. A device checks the TPID value in a received packet to determine whether the VLAN tag is an S-VLAN tag or C-VLAN tag. The device compares the configured TPID value with the TPID value in the packet. For example, if a frame carries the VLAN tag with TPID 0x8100 but the TPID configured for a customer network on a device is 0x8200, the device considers the frame untagged.

Figure 8-4  802.1Q encapsulation

Carrier's systems may use different TPID values in outer VLAN tags. When a Huawei device needs to interoperate with such a carrier system, set the TPID value to the value used by the carrier so that QinQ packets sent from the Huawei device can be transmitted across the carrier network. To prevent errors in packet forwarding and processing, do not set the TPID to any of values listed in Table 8-1.
Table 8-1  Protocol types and values

Protocol Type

Value

ARP

0x0806

RARP

0x8035

IP

0x0800

IPv6

0x86DD

PPPoE

0x8863/0x8864

MPLS

0x8847/0x8848

IPX/SPX

0x8137

LACP

0x8809

802.1x

0x888E

HGMP

0x88A7

Reserved

0xFFFD/0xFFFE/0xFFFF

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Updated: 2019-05-25

Document ID: EDOC1000097279

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