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S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Application Environment

Application Environment

As shown in Figure 21-5, CE1 and CE2 are edge devices on private networks of User A in different locations. The two private networks connect to the ISP network through PE1 and PE2. Networks of User A 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 21-5  Interface-based transparent transmission of Layer 2 control protocol packets on a Layer 2 network

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Updated: 2019-08-21

Document ID: EDOC1000142081

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