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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R012C00

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, HVRP, and Layer 2 protocol transparent transmission.
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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

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Updated: 2019-01-18

Document ID: EDOC1100038843

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