bfd demand enable

Use bfd demand enable to enable the Demand BFD session mode.

Use undo bfd demand enable to restore the default.

Syntax

bfd demand enable

undo bfd demand enable

Default

The BFD session is in Asynchronous mode.

Views

Interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

In demand mode, no BFD control packets are exchanged after the session is established. When the connectivity to another system needs to be verified explicitly, a system sends several BFD control packets that have the Poll (P) bit set at the negotiated transmit interval. If no response is received within the detection interval, the session is considered down. If the connectivity is found to be up, no more BFD control packets are sent until the next command is issued.

In asynchronous mode, both endpoints periodically send BFD control packets to each other. BFD considers that the session is down if it receives no BFD control packets within a specific interval.

Examples

# Enable the Demand BFD session mode on VLAN-interface 11.

<Sysname> system-view
[Sysname] interface vlan-interface 11
[Sysname-Vlan-interface11] bfd demand enable