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IS-IS: Deployment in IP Networks by Alvaro Retana, Russ White

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IS-IS Interaction with IP Over Redundant Packet Rings (IPoRPR)

Redundant Packet Rings (RPR) is a new form of layer 2 packet transport which provides several advantages. RPR rings appear to be single hop broadcast segments to layer 3 protocols, such as IP, but IS-IS has several modes of operation over them, which can take advantage of some unique RPR capabilities.

Unique RPR Capabilities

A single RPR ring is really a pair of counter-rotating fiber rings that use special layer 2 signaling to build ring topology information and sense link failures between any two devices on the ring. To better understand how IS-IS interacts with an RPR ring, we'll first quickly consider two of these capabilities, spatial bandwidth utilization and ring wrap, and ...

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