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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Application Environment

Application Environment

This section describes the applicable environment of Layer 2 Protocol Transparent Transmission.

As shown in Figure 5-127, CE1 and CE2 are edge devices on private networks of UserA in different locations. The two private networks connect to the ISP network through PE1 and PE2. Networks of UserA have redundant links, so MSTP is used to remove loops on the Layer 2 network. When MSTP packets sent by CEs reach PEs, PEs send the packets to the CPUs for processing because they cannot identify the network that MSTP packets come from. Layer 2 protocol calculations on the user network and ISP network affect each other and cannot be implemented independently.

You can configure Layer 2 protocol transparent transmission on PEs, so that MSTP packets are not sent to the CPUs of PEs for processing. This prevents PEs from participating in spanning tree calculation.

Figure 5-127 Interface-based transparent transmission of Layer 2 protocol packets on a Layer 2 network

Updated: 2019-08-09

Document ID: EDOC1000041694

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