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Troubleshooting Guide
CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches
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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).
What Is the Principle of Layer 2 Protocol Transparent Transmission?

What Is the Principle of Layer 2 Protocol Transparent Transmission?

Layer 2 protocol packets are transparently transmitted based on the following principles:
  • The destination multicast MAC address of a Layer 2 protocol packet is replaced with a specified multicast MAC address on the ingress Provider Edge (PE) of the ISP network.
  • The devices on the ISP network determine whether to process the protocol packet based on the configured transparent transmission mode.
  • When the Layer 2 protocol packet reaches the egress, the PE restores the destination multicast MAC address of the Layer 2 protocol packet to the standard destination multicast MAC address based on the mapping between the specified destination multicast MAC address and the Layer 2 protocol configured on the device. The egress PE also determines whether to process the packet based on the configured transparent transmission mode.
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Updated: 2020-01-07

Document ID: EDOC1000060766

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