Bay Networks 5000 Manual de usuario descargar pdf (Pagina 5)

Centillion LAN-ATM switches also

offer redundant, load-sharing power

supplies. All switching modules—

ATMSpeed, EtherSpeed, and

TokenSpeed—and power supplies

are fully hot-swappable. In the event

of a switch module failure, only the

users connected to the failed module

are affected; other modules continue

to service the rest of the network

while the failed module is replaced.

Centillion hardware and software

scales seamlessly to guarantee

infrastructure availability in even the

largest and most critical ATM enter-

prise networks, and has proven its

capability to support topologies of

several hundred switches and upwards

of 10,000 user connections.

Intranet Application Intelligence

With the explosion of intranet

applications, dramatically increasing

amounts of IP trafﬁc are traversing

overburdened routers. Every router

along the path must process the same

packet, and this type of hop-by-hop

processing causes the network trafﬁc

to experience signiﬁcant delay and

jitter. Centillion switches provide for

a standards-based solution to router

bottlenecks through the ATM Forum’s

MPOA speciﬁcation. MPOA allows

direct forwarding of intersubnet trafﬁc

between ATM edge switches, bypassing

overloaded routers and dramatically

improving the IP performance of the

overall network.

Ofﬂoading IP forwarding functions to

edge switches frees routers to process

other protocols, including IPX,

DECnet, and AppleTalk, relieving the

Layer 3 trafﬁc jam for legacy applications.

MPOA is fully backwards-compatible

and can be deployed in any existing

LANE-based network. In essence,

MPOA transforms an ATM network,

with all its ATM-attached routers and

edge switches, into a single distributed

router with each destination a maximum

of one hop away (see Figure 3).

This deterministic, delay-free

architecture provides support

for intranet applications and for

emerging technologies such as

IP-ATM QoS mapping, voice over

IP, video conferencing, and video-

on-demand.

Data Sheet Centillion 50, Centillion 100 and System 5000BH Switches 5

Figure 3: Intranet Application Intelligence in the MPOA-enabled Centillion Network.

Desktops in

Subnet A

Direct Layer 3

Shortcut via

Multi-Protocol

over ATM

Routed Layer 3

via Wirespeed

ATM Routing Engine

100 Mbps Ethernet

Network Center Servers

in Subnet B

ATM Routing Engine or

Centillion Multiprotocol Engine

Operating MPOA Server Facilities

Router-based

architecture data path

Key

Direct data path in the

MPOA-enabled

Centillion architecture

Centillion LAN-ATM

Switch Operating LANE &

MPOA Client Services

1 2 3 4 5 6 7 8 9 10 ... 15 16

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