Bay Networks BayRS Manuel d'utilisateur télécharger pdf (Page 8)

Trafﬁc Management

Comprehensive trafﬁc management

capabilities are provided through Data

Compression, Trafﬁc Prioritization,

and Uniform Trafﬁc Filters.

Data Compression Conﬁgurable

on a per-circuit or link basis, the

Bay Networks software-based Data

Compression feature is supported by

all Bay Networks routers, maximizing

internetwork performance by reduc-

ing the amount of bandwidth required

to transport LAN protocols over the

wide area. Data Compression is

currently supported over Frame

Relay, X.25, and Point-to-Point (PPP)

(dial-up lines, including ISDN, and

leased lines). Based on a Lempel-Ziv

algorithm, Bay Networks payload

compression mechanism provides an

aggregate compressed throughput

over BayStack AN and ANH full-

duplex serial links at speeds of up

to 128 Kbps.

Trafﬁc Prioritization Trafﬁc

Prioritization ﬁlters can assign a high

priority to time-sensitive and/or mis-

sion-critical trafﬁc, thereby reducing

the occurrence of session timeouts

and improving application response

times. Priority ﬁlters can be conﬁg-

ured to place packets into one of

three priority queues—high, normal,

or low—for transmission through a

Bay Networks router’s outbound

serial interface. Priority ﬁlters can

be applied to the complete family

of network and bridging protocols

supported by Bay Networks routers.

Priorities can be assigned to packets

based on their protocol, source

network, destination network, packet

type, and other protocol-speciﬁc

ﬁelds, as well as other ﬁelds that are

identiﬁable by an offset in a packet.

Trafﬁc Prioritization can be conﬁg-

ured to use either a strict dequeuing

algorithm or a bandwidth allocation

dequeuing algorithm to transmit

packets across a serial line.

Bay Networks strict dequeuing

algorithm transmits all packets from

the high-priority queue before

transmitting packets from the normal

and low-priority queues. The band-

width allocation dequeuing algorithm

ensures that large amounts of high-

priority trafﬁc do not prevent

transmission of other trafﬁc, based on

user-assigned bandwidth allocation

percentages for each queue.

Uniform Trafﬁc Filters Uniform

Trafﬁc Filters enables inbound and

outbound trafﬁc ﬁlters to be easily

established for all network and bridge

protocol trafﬁc. Uniform Trafﬁc Filters

provides an efﬁcient method for

developing an effective and compre-

hensive network security strategy.

In addition, Uniform Trafﬁc Filters

preserves WAN bandwidth and can

increase performance by reducing

network congestion.

Inbound trafﬁc ﬁlters can be conﬁg-

ured to accept or drop incoming

packets from any Bay Networks

router’s local area, ATM, or serial

network interface. Outbound trafﬁc

ﬁlters can be conﬁgured to drop out-

going packets destined for any Bay

Networks router’s serial interface.

Filters can be created using predeﬁned

protocol-speciﬁc ﬁelds or user-deﬁned

fields. Uniform Trafﬁc Filters can be

conﬁgured to accept or drop a packet

when a packet’s ﬁeld matches the

values deﬁned in the ﬁlter.

Additionally, such packet/ﬁlter

matches can be logged. Up to 31

inbound ﬁlters and 31 outbound

ﬁlters (including Trafﬁc Prioritization

ﬁlters) can be deﬁned for each proto-

col on every supported network

interface. Filter precedence can be

conﬁgured on an interface, reducing

ﬁlter deﬁnition complexity. All ﬁlters

are conﬁgured via Site Manager, the

node management application for

Bay Networks routers.

Remote Installation and

Management

EZ Install and EZ Update simplify

BayStack AN and ANH installation

and make router reconﬁguration

and software updates from a central

site quick and easy. Additionally,

standard RMON features are provided

by the RMON Data Collection Module

(DCM) in the 8-port BayStack

ANH for analyzing remote network

attributes.

Data Sheet BayStack Access Node and Access Node Hub8

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Bay Networks BayRS Manuel d'utilisateur Page 8

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