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PAROLI : ウィキペディア英語版
PAROLI

PAROLI is a proprietary protocol used inside a multi-shelf Carrier Routing System from Cisco and stands for "parallel optical link."〔Cisco IOS-XR (Glossary ), visited 6 December 2010〕
==Paroli usage==
It is used to connect the line-cards in a so-called line-card chassis with the switching fabric in a switch-fabric chassis. As the traffic between these kinds of chassis is comparable with the data that flows over a backplane in a single-shelf system the required bandwidth is very high and as is the need for reliability the shelves are interconnected using several fibre optic cables.
As this protocol/feature is only used in multi-shelf Cisco-CRS systems you will only find it in IOS XR the special ''high performance'' version of Cisco IOS.
There are basically two types of multi-shelf CRS systems:〔Cisco CSR-1 (Introduction to Multishelf System Cabling ), visited 6 december 2010〕
* single switch-fabric chassis and two line-card chassis
* two switch-fabric chassis and two line-card chassis
* four switch-fabric chassis and two line-card chassis
The second option allows for the most fault-tolerant system in a CRS system: although a single shelf switch-fabric allows for redundancy on most levels (power. fans, management-cards, switch-cards etc.), a multi-shelf system based on two switch-fabric cards and (at least) two line-card chassis will continue to run even when one of the switch-fabric shelfs is completely down. The four SCC/2 LCC also gives optimal availability and reliability without the loss of any throughput in case that a switch fabric module fails.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「PAROLI」の詳細全文を読む



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