Extreme Networks Summit 400-48t Bedienungsanleitung PDF herunterladen (Seite 3)

Extreme Networks Data Sheet

High Availability to Keep Users Connected and Productive

Resilient System Design

High Availability Uplinks

Summit 400-48t supports redundant

copper and/or ﬁber Gigabit Ethernet

uplinks and redundant 10 Gigabit

Ethernet uplinks for the highest uplink

capacity at the edge and the greatest

redundancy. If any single uplink port is

not available, Summit 400-48t can

automatically failover to the redundant

port for maximum resiliency and connec-

tivity. The result is true high availability—

the user stays connected to the network

and remains productive.

External Power System

Extreme Networks has long been a leader

in providing redundant power at the

edge, but Summit 400-48t takes this

feature to a new level. Extreme Networks

offers an External Power System that

supports multiple Summit 400-48t

switches, all with full power simultane-

ously. This power system provides 1-for-1

power for every Summit 400-48t connect-

ed. No more worrying about inadequate

power if more than a single switch fails; the

External Power System provides full

redundant power for every Summit 400-48t

switch. The External Power System auto-

matically senses when the internal power

supply has failed and immediately pro-

vides redundant power to the switch,

preventing any loss of data.

EAPS–Sub-Second Layer 2

Resiliency with Every Switch

With ExtremeWare 7.3e and beyond, the

standard edge license that ships with

Summit 400-48t provides EAPS-Edge

(RFC 3619) to deliver sub-second (usually

less than 50ms recovery) protection

switching to Layer 2 switches intercon-

nected in an Ethernet ring topology. EAPS

offers the advantage of converging in

signiﬁcantly less time than Spanning Tree

Protocol (STP) or even Rapid Spanning

Tree (802.1w) when a link breaks in the

ring. 50ms convergence times are invisible

to routing protocols so the routing protocols

don’t need to re-converge. Voice-over-IP

(VoIP) calls don’t drop and video feeds

don’t ﬂicker because EAPS enables the

users to stay connected even when there

are link failures in the upstream network.

Software Enhanced Availability

Summit 400-48t uses advanced Layer 3

availability intelligence to route around

problems in the upstream network so that

even if part of the network infrastructure

is down, users remain connected to the

network and are productive. Using

advanced Layer 3 protocols like OSPF and

ESRP, the Summit 400-48t is continuously

aware of the status of uplink connections,

and dynamically routes around any

problem. Network administrators can now

create non-stop routing topologies that

combine with switch hardware redundan-

cy to deliver higher levels of availability.

Equal Cost Multi-Path

Summit 400-48t supports the Equal Cost

Multi-Path feature that not only improves

switch availability, but also improves

performance and saves the customer

money. Equal Cost Multi-Path enables dual

uplinks to be load balanced for perfor-

mance and cost savings while also

supporting redundant failover. If one

uplink fails, trafﬁc is automatically routed

to the remaining uplink and connectivity

is maintained.

Rapid Spanning Tree (802.1w)

Summit 400-48t includes both standard

STP and Rapid Spanning Tree Protocol

(RSTP), which provide standards-based

Layer 2 resiliency. RSTP delivers

signiﬁcantly faster convergence than STP,

though never in the sub-second interval

that EAPS can provide. Summit 400-48t

also provides compatibility with Per-VLAN

Spanning Tree (PVST+) and Extreme

Multiple Instance Spanning Tree (EMISTP).

These protocols run in compatibility mode,

single domain per port, to support resilient

connectivity with aggregation switches

running EMISTP and PVST+.

Software Redundant Port

In addition to EAPS, Summit 400-48t

provides a software redundant port—a

unique alternative to Spanning Tree for

redundant link management. Operating at

Layer 1, this resiliency alternative provides

simple, efﬁcient link failovers based on

physical port status, without the need to

run a bridge topology protocol such as

STP. This feature works equally well with

single ports or load-shared port aggrega-

tions, and provides easy-to-conﬁgure

physical link redundancy.

Availability is critical to end-user productivity. Advanced availability features normally found on more expensive core switches are

now standard on Summit 400-48t. Features such as hardware redundancy that keep the switch up and running are combined

with advanced ExtremeWare availability software to dynamically route around problems in the network so that the end user is

not only connected, but remains productive.

Summit 400-48t HIgh Availability Features

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