Allied Telesis AT-8948 Scheda tecnica - Pagina 2

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AlliedWare

| Operating System

BGP-4 - Border Gateway Protocol version 4

BGP-4 is an external gateway protocol which allows

two routers/switches in different routing domains,

known as Autonomous Systems to exchange routing

information.This facilitates the forwarding of data

across the border of the routing domains. BGP-4

allows routers/switches to learn multiple paths,

choose the best path for routing information and

install that path in the IP routing table.

WAN Load Balancer

The WAN load balancer enables the router to

combine bandwidth from multiple WAN

connections for increased throughput and

redundancy.When a router simultaneously connects

to multiple WANs, the WAN load balancer will

distribute the traffic based on any one of a number

of selectable balancing algorithms. A typical example

would be a router that has two Internet

connections each exchanging data to remote sites

via different Internet providers. In this case an outage

limited to one network will not result in a loss of

connectivity to these sites.

QoS - Quality of Service

QoS intelligently manages network traffic to allow

stable and predictable end-to-end network

performance. Comprehensive, low latency QoS

features operating at wire-speed provide flow-

based traffic management with full classification,

prioritization, traffic shaping and min/max

bandwidth profiles. AlliedWare's

ideal for service providers wanting to ensure

maximum availability of premium voice, video, and

data services, and at the same time manage

customer service level agreements. For enterprise

customers, QoS protects productivity by

guaranteeing performance of business-critical

applications including VoIP services, and helps to

restore and maintain responsiveness of enterprise

applications in the networked

workplace.

Multicasting

PIM - Protocol Independent Multicast

PIM has two modes: Dense Mode (PIM-DM) and

Sparse Mode (PIM-SM).

PIM-DM relies on the presence of an existing unicast

routing protocol to provide routing table data to

build up information for the multicast forwarding

database.This process is independent of the

mechanisms of the specific unicast routing protocol.

PIM-SM provides efficient communication between

members of sparsely distributed groups - the type

of groups that are most common in wide-area

internetworks. PIM-SM limits multicast traffic so

only those network devices interested in receiving

traffic for a particular group receive that traffic.

Allied Telesis

IGMPv2 - Internet Group Management Protocol

IGMP is used between hosts and multicast routers

and switches on a single physical network to

establish hosts' membership in particular multicast

groups. Multicast routers use this information, in

conjunction with a multicast routing protocol, to

support IP multicast forwarding across the Internet.

Management

GUI and SSL - Graphical User Interface and Secure

Sockets Layer

The GUI is a web-based management tool designed

for intuitive, easy-to-use device configuration and

monitoring. Its purpose is to make complicated tasks

simpler and regularly performed tasks quicker. A GUI

connection can be secured with the use of the SSL.

SSL is a security protocol that provides secure

communication by allowing the client to verify the

servers identity before either side sends any sensitive

information. SSL encrypts data to prevent a third

party from interfering with the message.

SSH - Secure Shell

Secure management is increasingly important in

modern networks, as easy, effective device

management and the need for security are two

almost universal requirements. SSH is a secure Telnet

type access that provides strong authentication and

secure communication over insecure channels. While

Telnet sends commands over the network in

plaintext, SSH sends them encrypted. With SSH, a

QoS features are

client can safely log into another computer over a

network, execute commands in a remote machine, or

move files from one machine to another.

Scripting

The Scripting facility allows sequences of commands

to be stored in a script and replayed at any time so

that switches can be easily and quickly configured.This

is useful when developing a complex configuration,

making the same configuration change to several

different devices or security appliances, or introducing

a configuration change that must occur at a particular

time. Scripts can be activated from the command line,

from a trigger, or when users log in.

Triggers

A trigger sets off an ordered sequence of scripts and

commands to be executed when a certain event

occurs, providing a powerful mechanism for

automating the execution of commands in response

to certain events. For example, triggers can be

configured to collect diagnostic information after a

reboot. Each trigger may reference multiple scripts

and any script can be used by any trigger.

High Availability

Link Aggregation

Link aggregation (trunking) allows a number of

individual switch ports to be combined, forming a

single logical connection of higher bandwidth.This

provides a higher performance link, and also

provides redundancy for a more reliable and

robust network.

AlliedWare

supports IEEE standard 802.3ad link

aggregation, which can be configured manually, or

automated via the use of Link Aggregation Control

Protocol (LACP).

LACP automatically detects multiple links between

two LACP enabled devices and configures them

to use their maximum possible bandwidth by

automatically combining the links.

VRRP - Virtual Router Redundancy Protocol

VRRP provides automatic backup in mission-critical

environments.This feature enables multiple routers

or switches to share a virtual IP address that

serves as the default LAN gateway. Should the

master fail, the other devices assume the virtual IP

address. LAN devices can continue to be

configured with a single default gateway address,

and because VRRP is a standard Internet protocol,

full interoperability with other VRRP-supported

products is assured.

EPSR – Ethernet Protection Switched Rings

Ethernet Protection Switched Rings allow several

switches to form a protected ring with sub 50ms

failover.This feature is perfect for high performance at

the core of enterprise or provider access networks.

MSTP - Multiple Spanning Tree Protocol

MSTP addresses the limitations in the existing

spanning tree protocols, Spanning Tree Protocol

(STP) and Rapid Spanning Tree Protocol (RSTP).

MSTP is similar to RSTP in that it provides loop

resolution and rapid convergence. However it also

has the significant extra advantage of making it

possible to have different forwarding paths for

different multiple spanning tree instances.This

enables load balancing of network traffic across

redundant links.

Networks using multiple VLAN topologies that

employ alternative physical links are supported by

MSTP. MSTP also supports multiple spanning tree

instances on any given link within a network and

can group bridges into 'regions' that appear as a

single bridge to other devices.

Note: Features available on individual products are

dependent on product hardware. For more

information go to www.alliedtelesis.com.