| Description | Each node in the Intelligent Protection Switching (IPS)
is one of the following states.
Idle - In this mode the node is ready to perform protection
and it sends to both neighboring nodes idle IPS messages,
which include self in the source address field
{0, SELF, 0, S}.
PassThrough - Node participate in a protection switch by
passing the wrapped traffic and long path signalling through
itself. This state is entered based on received IPS messages.
Wrapped - Node participate in a protection switch with a wrap
present. This state is entered based on protection request
issued locally or based on received IPS messages.
When interface is down the value for IPS state
is passThrough. |