Emergency Mode - Lenovo RackSwitch G8264 Application Manual

Emergency Mode

276
G8264 Application Guide for ENOS 8.4
Note: Emergency Mode is supported only in version 1.0 of the OpenFlow
standard.
By default, Emergency mode is disabled. In this state, if the connection to the
controller fails, the switch will behave as described in Fail Secure mode for
Openflow 1.3.
To enable Emergency mode, use the following command:
RS G8264(config)# openflow instance <instance ID>
RS G8264(config­openflow­instance)# emergency
In Emergency mode enabled state, if the connection to the controller fails, the
switch tries to establish connection with any of the other configured controllers. If
it is unable to connect with any controller, it enters Emergency mode. It replaces
the flow entries with the entries from the emergency flow table.
The switch stays in the Emergency mode for the time configured as the Emergency
timeout interval (default value is 30 seconds), after which the switch tries to
establish connection with any configured controller.
 If connection with a controller is established, the switch exits Emergency mode.
Entries in the Emergency flow table are retained. If desired, the controller may
delete all the emergency flow entries.
 If connection with a controller is not established, the switch stays in Emergency
mode and continues to forward packets based on the Emergency flows. It retries
to establish a connection with a controller every time the Emergency timeout
interval expires.
Emergency mode can be activated or deactivated per instance. To activate
Emergency mode on an instance, use the following command:
RS G8264# openflow instance <instance ID> enter­emergency
To deactivate Emergency mode on an instance, use the following command:
RS G8264# no openflow instance <instance ID> enter­emergency