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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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Protocol Packet Transparent Transmission in a VLAN

Protocol Packet Transparent Transmission in a VLAN

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

If the device works as the gateway or provides the snooping functions for only some VLANs, the device does not need to process protocol packets in other VLANs. After the protocol packets in other VLANs are sent to the switch, the switch forwards them to other devices. This mechanism is called software forwarding. Protocol packet processing in software forwarding decreases 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 in the VLANs to other devices, improving forwarding efficiency.

Updated: 2019-08-21

Document ID: EDOC1000142081

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