The value of vRtrLdpAdjMaxBackoff specifies the maximum
backoff time. For each successive failure of the LDP
session startup, the backoff interval (the time for which
the router waits before retrying) increases exponentially.
If the backoff interval exceeds vRtrLdpAdjMaxBackoff, the
router will not backoff anymore and will give up trying
to establish the LDP session. A value of 0 for
vRtrLdpAdjMaxBackoff indicates that the backoff interval
remains constant and will not increase exponentially. In
effect the router will try to establish an LDP session
till it succeeds