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Metro Ethernet by Sam Halabi

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S
Shared Explicit (SE).

Reservation style that allows a receiver to explicitly select a reservation for a group of senders, rather than one reservation per sender, such as in the FF style. Only a single reservation is shared between all senders listed in the particular group.

shared risk link group (SRLG).

A grouping that indicates similar risk characteristics for a set of elements. A set of fibers, for example, that share the same conduit belong to the same SRLG, because if the conduit is cut, all fibers will fail.

shortest path first (SPF) algorithm.

Routing algorithm that iterates on length of path to determine a shortest-path spanning tree. Commonly used in link-state routing algorithms. Sometimes called Dijkstra's algorithm.

SONET/SDH terminal ...

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