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Configuration Guide - Ethernet Switching

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

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, and Layer 2 protocol transparent transmission.
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Protocol Packet Transparent Transmission in a VLAN

Protocol Packet Transparent Transmission in a VLAN

When the device used as the gateway or as a Layer 2 switch enabled with snooping functions such as DHCP/IGMP/MLD snooping, then the device needs to parse and process the corresponding protocol packets. Protocol packets received by an interface are sent to the CPU for processing and the interface sends protocol packets without differentiating VLANs. If the preceding snooping functions are deployed, protocol packets from all VLANs are sent to the CPU for processing.

If the device is a gateway for some VLANs or snooping functions are deployed in some VLANs, the device does not need to process protocol packets from other VLANs. After the protocol packets in other VLANs are sent to the CPU, the CPU needs to forward them to other devices. This mechanism is called software forwarding. Protocol packet processing in software forwarding decreases the forwarding efficiency.

To address this issue, deploy protocol packet transparent transmission in VLANs where protocol packets do not need to be processed. This function enables the device to transparently transmit the protocol packets from VLANs to other devices, improving forwarding speed and efficiency.


Only the S5720EI, S5720HI, S5730HI, S6720EI, S6720HI, and S6720S-EI support this function.

Updated: 2018-12-24

Document ID: EDOC1100038339

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