Avaya Configuring IP Multicasting Services Manual do Utilizador Página 78

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Configuring IP Multicasting Services
6-2 114064 Rev. B
About Line Resource Reservation
Emerging realtime multicast applications for 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.
Resource reservation protocols such as Stream Protocol 2 (ST2) address the
requirements of delay-sensitive applications by distributing information among
routers to achieve a guaranteed quality of service (QoS) for specific packet
streams (flows).
By reserving bandwidth for QoS requests, a system of line resource reservation
can meet the demands of realtime applications and maintain bandwidth for other
traffic.
Resource Manager
The Bay Networks Resource Manager lets you define a certain percentage of a
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 Resource Manager allocates bandwidth from the reservable
bandwidth, reducing the bandwidth available for other requests.
Supported Media
You can enable the Resource Manager on 10-Mb/s Ethernet, MCT1, HSSI, and
synchronous interfaces that are configured with the ST2 protocol. The Resource
Manager supports the following synchronous interface encapsulation methods:
Point-to-Point Protocol (PPP)
Bay Networks Standard
Frame Relay
ATM DXI
Note: You cannot use line resource management on a line you configured for
PPP multilink.
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