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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

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 Scenarios for Layer 2 Protocol Transparent Transmission

Application Scenarios for Layer 2 Protocol Transparent Transmission

As shown in Figure 22-6, 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 22-6  Interface-based transparent transmission of Layer 2 control protocol packets on a Layer 2 network

Updated: 2019-10-18

Document ID: EDOC1000178310

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