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routing
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... VLSP is derived from the OSPF link-state routing protocol described
in [RFC2328], written by John Moy, formerly of Proteon, Inc.,
...
...
VLSP is a dynamic routing protocol. It quickly detects topological
changes in the switch fabric (such as, switch ...
... A relationship formed between selected neighboring switches for
the purpose of exchanging routing information. Not every pair of
neighboring switches become adjacent.
...
... multi-access links. This in turn
reduces the amount of routing protocol traffic and the size of the
topological database ...
... The VLS protocol is derived from the OSPF link-state routing protocol
described in [RFC2328].
...
... Routing Path Information ...
... neighbors to which it is adjacent. This reduces the amount of
routing protocol traffic across the fabric, particularly for
multi-access ...
... broadcasts can lead to undesirable
synchronization of routing packets unless the interval timers have
been implemented to avoid drift. If it is not possible to
...
... The area data structure contains all the information needed to run
the basic routing algorithm. One of its components is the link state
database -- the collection of all switch link ...
... switch. The
designated switch performs the following functions for the routing
protocol:
o The designated switch ...
... creates adjacencies between neighboring switches for the purpose
of exchanging routing information. Not every two neighboring
switches will become adjacent. On a multi-access link ...
... Perlman], or any of a number of standard textbooks dealing with
network routing.
Note that whenever there is a change in an adjacency relationship, or
...
... synchronized throughout the switch fabric, processing of both
incoming and outgoing routing protocol packets should take priority
over ordinary data packets ...
... support those optional capabilities. Thus, switches of differing
capabilities potentially can be mixed within a single VLSP routing
domain.
...
... Two optional capabilities are currently defined in the options field:
routing based on Type of Service (TOS) and support for external
...
... Type of Service (TOS) and support for external
routing beyond the local switch fabric. These two capabilities are
specified in the options field ...
... The E-bit specifies the switch's external routing capability. If
the E-bit is set, the switch ...
... Link state advertisements are used to describe various pieces of the
routing topology within the switch fabric. Each switch in the fabric
...
... link. Since the current version of VLSP
does not support routing based on nonzero types of service, this
field contains a value of zero.
...
... link. The smaller this value is set,
the faster topological changes will be detected. However, a
smaller interval will also generate more routing traffic. A
typical value for a local area network ...