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Link State Definition and Protocol

IP.com Disclosure Number: IPCOM000110281D
Original Publication Date: 1992-Nov-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 3 page(s) / 109K

Publishing Venue

IBM

Related People

Drake, JE: AUTHOR [+3]

Abstract

The link activation protocol is used to activate a link between two adjacent nodes. This protocol allows each node to: . Identify itself. . Establish the characteristics of the link. . Allows the exchange of node characteristics. . Allows the transition of the link from a state of disabled, that does not permit user or network control traffic to traverse the link, to a link state called online, that does.

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This is the abbreviated version, containing approximately 52% of the total text.

Link State Definition and Protocol

       The link activation protocol is used to activate a link
between two adjacent nodes.  This protocol allows each node to:
       .  Identify itself.
       .  Establish the characteristics of the link.
       .  Allows the exchange of node characteristics.
       .  Allows the transition of the link from a state of disabled,
that does not permit user or network control traffic to traverse the
link, to a link state called online, that does.

      Link activation consists of a single message exchange (i.e., a
link  activation request and a link activation response) on a
short-lived, reliable transport connection between the nodes
activating the link.  The use of a transport protocol allows the link
activation protocol to be completely independent of the DLC
associated with the link.

      When the two adjacent nodes establish physical connectivity,
the link is in disabled state.  After link activation exchange, the
link's charactistics are established and the link is either in an
online state or offline state.  The link's characteristics cannot be
changed, but the link state can via an operator command, link state
transition exchange, or a link failure.  A node can change a link's
state via the link state transition protocol.  This protocol consists
of a single message exchange (i.e., a link state transition request
and a link state transition response) on a short-lived, reliable
transport connection.

      A link can take on different link states.  Each link state
defines the traffic allowed to traverse the link.  The following are
the link states and their characteristics:
       .  Online - network control traffic can traverse the link; new
user connections can be established; link liveness messages are sent
to detect link failure.
       .  Quiesce - network control traffic can traverse the link; no
new user...