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.
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