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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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Configuring Transparent Transmission of Protocol Packets in a VLAN

Configuring Transparent Transmission of Protocol Packets in a VLAN

Context

When the device used as the gateway or Layer 2 switches 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. The interface sends protocol packets without differentiating VLANs. That is, if any of the preceding snooping functions are deployed, protocol packets from all VLANs are sent to the CPU for processing.

If the device is a gateway of some VLANs or snooping functions is deployed in 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 CPU, the CPU needs to forward them to other devices. This mechanism is called software forwarding. Software forwarding affects the forwarding speed and efficiency of protocol packets because protocol packets need to be processed.

To address this issue, deploy transparent transmission of protocol packets 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, which improves the forwarding speed and efficiency.

The switch can transparently transmit the following protocol packets: CFM/ARP/BFD/DHCP/DHCPV6/HTTP/IGMP/MLD/ND/PIM/PIMv6/PPPoE/TACACS.

NOTE:

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

Procedure

  • Configure transparent transmission of protocol packets in a VLAN.
    1. Run system-view

      The system view is displayed.

    2. Run vlan vlan-id

      A VLAN is created and the VLAN view is displayed. If the specified VLAN has been created, the VLAN view is directly displayed.

    3. Run protocol-transparent

      Transparent transmission of protocol packets in a VLAN is configured.

      By default, transparent transmission of protocol packets in a VLAN is disabled.

  • Configure transparent transmission of protocol packets in multiple VLANs.
    1. Run system-view

      The system view is displayed.

    2. Run vlan batch { vlan-id1 [ to vlan-id2 ] } &<1-10>

      Create one or more VLANs.

    3. Run vlan range { vlan-id1 [ to vlan-id2 ] } &<1-10>

      A temporary VLAN range is created and its view is displayed. If the VLAN range has been created, this command directly displays the VLAN-Range view.

      Uncreated VLANs cannot be added to a temporary VLAN range.

    4. Run protocol-transparent

      Transparent transmission of protocol packets in VLANs is configured.

      By default, transparent transmission of protocol packets is disabled in VLANs of a temporary VLAN range.

NOTE:
  • The vlan range command configuration is not saved in the configuration file. If services are configured in the VLAN-Range view, the service configurations of all the VLANs in the VLAN range will be saved in the configuration file.
  • After transparent transmission of protocol packets is configured in a VLAN, the VLAN cannot be configured as a multicast VLAN or control VLAN.
  • Before running this command, ensure that IGMP or MLD snooping has been disabled in the VLAN. Otherwise, the configuration may fail.

Verifying the Configuration

Run the display this command in the VLAN view to check the configuration of transparent transmission of protocol packets in a VLAN.

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Updated: 2018-12-24

Document ID: EDOC1100038339

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