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S12700 V200R012C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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Licensing Requirements and Limitations for Layer 2 Protocol Transparent Transmission

Licensing Requirements and Limitations for Layer 2 Protocol Transparent Transmission

Involved Network Elements

Other network elements are not required.

Licensing Requirements

Layer 2 protocol transparent transmission is a basic feature of a switch and is not under license control.

Version Requirements

Table 21-2  Products and versions supporting Layer 2 protocol transparent transmission


Product Model

Software Version


S12708, S12712

V200R005C00, V200R006C00, V200R007C00, V200R007C20, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00


V200R010C00, V200R011C10, V200R012C00, V200R013C00


V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Feature Limitations

  • When the default CPCAR value is used, the device transparently transmits a maximum of 60 Layer 2 protocol packets per second. Excess packets are discarded.
  • When PVST+ packets need to be transparently transmitted, disable VBST on the interface. Otherwise, PVST+ packets cannot be transparently transmitted.
  • Do not replace the destination MAC addresses of STP, GVRP, and GMRP packets with the same multicast MAC address.
  • When configuring Layer 2 protocol transparent transmission, do not use any of the following multicast MAC addresses to replace the destination MAC address of Layer 2 protocol packets:

    • Destination MAC addresses of BPDUs: 0180-C200-0000 to 0180-C200-002F
    • Destination MAC address of Smart Link packets: 010F-E200-0004
    • Special multicast MAC addresses: 0100-0CCC-CCCC and 0100-0CCC-CCCD. By default, 0100-0CCC-CCCC and 0100-0CCC-CCCD are not destination MAC addresses of BPDU packets.
    • Common multicast MAC addresses that have been used on the device
  • To transparently transmit BPDUs such as DLDP and EFM packets on a physical interface, the L2PT tunnel egress cannot be the Eth-Trunk. Otherwise, BPDU negotiation may be abnormal.
  • When an interface is enabled to transparently transmit the packets of a certain protocol, these packets do not participate in protocol processing. For example, after an interface is enabled to transparently transmit STP packets, the interface does not participate in STP calculation. Therefore, you are advised not to enable a protocol and the transparent transmission of this protocol on the same interface.
  • Only the X series cards support configuring VPLS-based Layer 2 Protocol Transparent Transmission.

Updated: 2019-01-18

Document ID: EDOC1100038103

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