erps vpls-subinterface enable

Function

The erps vpls-subinterface enable command enables topology change notification of an interface to instruct VSI-bound sub-interfaces or VLANIF interfaces to update MAC address entries promptly after the ERPS ring topology changes.

The undo erps vpls-subinterface enable command disables topology change notification of an 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.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731S-H, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730S-H, S6730-H support this command.

Format

erps vpls-subinterface enable

undo erps vpls-subinterface enable

Parameters

None

Views

GE interface view, XGE interface view, 25GE interface view, 40GE interface view, 100GE interface view, Eth-Trunk interface view, MultiGE interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

In normal situations, when an ERPS ring topology changes, the ERPS ring reselects a blocked interface, and accordingly all devices will update MAC address entries. However, if an ERPS-enabled interface has VSI-bound sub-interfaces or VLANIF interfaces, which cannot detect topology changes immediately, the MAC address entries will not be updated on the VPLS network in time. To resolve this problem, run the erps vpls-subinterface enable command to enable an interface to instruct VSI-bound sub-interfaces or VLANIF interfaces to update MAC address entries promptly after the ERPS ring topology changes.

Prerequisites

An interface has been added to an ERPS ring using the erps ring (interface view) command.

Configuration Impact

After the erps vpls-subinterface enable command has been run, when the forwarding status of an interface changes to Discarding, its VSI-bound sub-interfaces or VLANIF interfaces will change to the Flowdown state to prevent loops on the VPLS network on which a CE is dual-homed to PEs.

Precautions

The erps vpls-subinterface enable and stp vpls-subinterface enable commands are mutually exclusive on the same interface.

If an interface is deleted from all ERPS rings using the undo erps ring command, the erps vpls-subinterface enable command configuration on the interface is also deleted.

If a user is delivering the ERPS configuration, the erps vpls-subinterface enable command fails to be run.

Example

# Enable GE0/0/1to instruct VSI-bound sub-interfaces or VLANIF interfaces to update MAC address entries promptly after the ERPS ring topology changes.

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] erps ring 1
[HUAWEI-GigabitEthernet0/0/1] erps vpls-subinterface enable