Avaya Configuring Line Services Manual do Utilizador Página 232

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Configuring Line Services
8-2
Overview of Line Resource Management Services
Emerging realtime multicast applications that involve digitized voice and video
(such as multimedia conferencing and virtual reality) require a level of consistent
network service that routers cannot meet using simple first-in-first-out (FIFO)
queuing mechanisms. The existing best-effort delivery service of IP networks,
where variable queuing delays and data loss due to congestion are acceptable, is
not sufficient.
New network protocols need to address the requirements of delay-sensitive
applications. Resource reservation protocols such as Stream Protocol 2 (ST2)
distribute information among routers to achieve a guaranteed Quality of Service
(QoS) that satisfies the data-rate and delay characteristics of specific packet
streams (flows).
As protocols begin to allow a guaranteed QoS, network administrators need to
explicitly manage their network’s bandwidth to both meet the increasing demands
of realtime applications and maintain bandwidth for other traffic.
Line Resource Manager (LRM)
The Line Resource Manager (LRM) is part of the Bay Networks router Circuit
Resource Manager (CRM) feature. LRM lets you define a certain percentage of a
particular line’s bandwidth as reservable. Applications that require a guaranteed
QoS can negotiate for the reservable bandwidth. When the router honors a
reservation request, the LRM allocates bandwidth from the reservable bandwidth,
reducing the bandwidth available for other requests.
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