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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 the ERPS over VPLS Function

Configuring the ERPS over VPLS Function

If an ERPS-enabled interface has VSI-bound sub-interfaces or the switch has VSI-bound VLANIF interfaces, the sub-interfaces or the VLANIF interfaces cannot detect topology changes immediately on the main interface so that the MAC address entries cannot be updated in time on the VPLS network. To resolve this problem, configure topology change notification on the main interface.


  1. A routing protocol has been run on the PEs on the VPLS network to ensure that they can communicate.
  2. Basic MPLS capabilities have been configured on the VPLS network, and LDP LSPs has been established.
  3. VPLS connections have been established between each two PEs, and each Ethernet sub-interface or VLANIF interface has been bound to a VSI.
  4. Interfaces on CEs and PEs have been added to the ERPS ring.


On the VPLS network shown in Figure 18-15, CEs are dual-homed to PEs. However, PE3 receives two copies of CE1 traffic from both PE1 and PE2. To resolve this problem, enable ERPS on CE1, CE2, PE1, and PE2 and configure CE2's interface2 as an RPL owner port to block traffic from CE1. In this way, CE1's traffic reaches PE3 over PE1 without traversing CE2, thereby preventing any duplicate traffic or loops.

In Figure 18-15, the ERPS ring connects to a VPLS network through Ethernet sub-interfaces or VLANIF interfaces. To ensure that the VPLS network can promptly detect topology changes of the ERPS ring, enable topology change notification on the main interface through which PE1 and PE2 access the ERPS ring.

Figure 18-15  Example for configuring ERPS over VPLS in scenarios where a CE is dual-homed to PEs (through Ethernet sub-interfaces or VLANIF interfaces)


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


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run erps vpls-subinterface enable

    Topology change notification is enabled on the interface.

    By default, the interface does not instruct VSI-bound sub-interfaces or VLANIF interfaces to update MAC address entries promptly after the ERPS ring topology changes.

    After topology change notification is enabled on the interface, when the forwarding status of the interface changes to Discarding, its VSI-bound sub-interfaces or member interfaces of the VLANIF interface will change to the Discarding state to prevent loops on the VPLS network on which a CE is dual-homed to PEs.

Verifying the Configuration

Run the display this command in the interface view to verify that topology change notification is enabled.

Updated: 2018-12-24

Document ID: EDOC1100038339

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