This attribute specifies the time this interface waits for the
RESTART ACKNOWLEDGE message from the adjacent network
after sending a first RESTART message. Upon timer expiry, another
RESTART message is sent. After the second expiry, the interface is
treated as idle.
If the restartReqTimer attribute is set to the default value, then the
interface is treated as idle when it receives an indication that the
link is up and does not send a RESTART message.