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Differentiated Services Code Point

(DSCP) bits based on policy filter

information. Policy-based filters may

be statically defined or set dynamically

from the central Optivity Policy Server.

DiffServ identifies three classes of

Service: Expedited Forwarding, Assured

Forwarding, or Default. Several dequeu-

ing mechanisms are supported for such

traffic, including Strict Dequeuing,

Bandwidth Allocation, Weighted Fair

Queuing (WFQ), Random Early

Detection (RED, and Weighted

Random Early Detection (WRED).

Remote installation

and management

Remote installation of the ARN router

is simplified through the use of EZ

Install and EZ Update, two software

applications designed to make installa-

tions, reconfigurations, and software

updates from a central site quick and

easy. In addition, remote management

is facilitated by the DCM’s standard

Ethernet RMON features, which can

be used to analyze the attributes and

operating patterns of the remote network.

EZ Install

The EZ Install application eliminates

the time and expense of sending a

technical resource to install and

configure an ARN router. At the

remote site, once the LAN and serial

interfaces of the ARN are connected

and the unit is powered up, the ARN

obtains its software image from flash

memory and its configuration file from

EZ Install over the network. By using

EZ Install, the ARN is able to auto-

matically obtain its IP address from

a central site Nortel Networks router,

and its configuration file from a central

site server using the BootP protocol

(see Figure 4). After verifying that a

configuration file has been successfully

downloaded to the DRAM of the

ARN via EZ Install, the configuration

data is saved to flash memory for

nonvolatile local storage.

place packets into one of three priority

queues—high, normal, or low. Priority

filters can be applied to the complete

family of network and bridging protocols

supported by Nortel Networks routers.

Priorities can be assigned to packets

based on their protocol, source, desti-

nation address, packet type, and other

protocol-specific fields. Other fields

that are identifiable by a fixed offset in

a packet can also be assigned priorities.

Traffic Prioritization uses either a strict

dequeuing algorithm or a bandwidth

allocation dequeuing algorithm to

transmit packets across a serial line.

Strict dequeuing transmits all packets

from the high-priority queue before

transmitting packets from the normal

and low-priority queues. Bandwidth

allocation dequeuing ensures that large

amounts of high-priority traffic do not

prevent transmission of other traffic,

based on configurable bandwidth allo-

cation percentages for each queue.

Uniform Traffic Filters

Inbound and outbound Uniform Traffic

Filters can be applied to all network and

bridge protocol traffic. Uniform Traffic

Filters is a useful tool for network

administrators in developing an effec-

tive and comprehensive network securi-

ty strategy. In addition, Uniform Traffic

Filters preserves WAN bandwidth and

can increase performance by reducing

network congestion.

Uniform Traffic Filters can be config-

ured to accept or drop packets at any

Nortel Networks router’s network

interface. Additionally, they can log

matches between a packet and a filter,

providing an audit trail for particular

network activity.

Differentiated Services for QoS

In addition to other traffic manage-

ment features, BayRS supports

Differentiated Services (DiffServ)

for scalable, end-to-end, standards-

based IP QoS. The ARN will classify

and condition packets by setting

EZ Update

The EZ Update application facilitates

the automatic downloading of soft-

ware updates and configuration files,

minimizing the time and expense

associated with remote site software

maintenance. The existing ARN

configuration file and software image

are stored in the nonvolatile flash

memory of the ARN for use as backup

in case problems are encountered

while downloading new software.

To use EZ Update, the ARN is dynami-

cally configured to boot its configura-

tion file and software image from the

central site. The ARN can then be

rebooted or power-cycled, and a new

configuration file and/or software image

downloaded to the DRAM of the

ARN from a central site server. Once

it has been determined that the new

configuration file or software update is

acceptable, it can be saved to the flash

memory of the ARN, replacing the

previous configuration file and/or

software image.

SNMP-based node management

Nortel Networks Optivity network

management applications deliver a

complete, SNMP-based enterprise

management solution that provides

operation, policy, and design services

for end-to-end management of routers,

hubs, and switches. This approach

enables proactive network planning and

accelerates problem solving, resulting in

reduced costs associated with owning

and operating corporate internetworks

of any size.

Router system management

System management directly supports

the Bay Command Console (command

line interface), HTTP-based, SNMP-

based, and the Technican’s Interface for

router configuration (static and dynam-

ic), monitoring, and management ser-

vices. Depending on the service, these

can be accessed out-of-band, through a

local console or modem connection or

in-band through a telnet connection.

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Bay Networks BayRS Manuel d'utilisateur Page 6

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