efm trigger if-down

Function

The efm trigger if-down command associates EFM with an interface.

The undo efm trigger if-down command disassociates EFM from an interface.

By default, EFM OAM is not associated with any interface.

Format

efm trigger if-down

undo efm trigger if-down

Parameters

None

Views

Ethernet interface view, GE interface view, XGE interface view, 25GE interface view, 40GE interface view, 100GE interface view, MultiGE interface view, port group view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

EFM can be associated with interfaces. On a scenario with primary and backup links, if EFM detects a fault on the primary link, it will set the protocol status of the associated interface to ETHOAM Down, speeding up routing convergence. Traffic can be fast switched to the backup link.

Prerequisites

EFM has been enabled globally and on an interface, and is in detect state.

Precautions

If EFM is associated with an interface and detects a link fault, the protocol status of the interface becomes ETHOAM Down, and no packet except EFM OAMPDUs can be forwarded by the interface, and all Layer 2 and Layer 3 services are blocked. Therefore, associating EFM with an interface may greatly affect services. When the interface detects link recovery using EFM, the interface can forward all packets and unblocks Layer 2 and Layer 3 services.

If Layer 2 and Layer 3 services are blocked due to a misoperation, run the undo efm trigger if-down command in the interface view to restore services.

Example

# Associate EFM with Layer 2 interface GigabitEthernet0/0/1.

<HUAWEI> system-view
[HUAWEI] efm enable
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] efm enable
[HUAWEI-GigabitEthernet0/0/1] efm trigger if-down

# Associate EFM with Layer 3 interface GigabitEthernet0/0/1.

<HUAWEI> system-view
[HUAWEI] efm enable
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] undo portswitch
[HUAWEI-GigabitEthernet0/0/1] efm enable
[HUAWEI-GigabitEthernet0/0/1] efm trigger if-down