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Extreme Networks Data Sheet

Voice-Class Availability

Modular Operating System

for Non-Stop Operation

True Preemptive Multitasking

and Protected Memory

The Summit X450a series switch allows

each of the many applications—such as

Open Shortest Path First (OSPF) and

Spanning Tree Protocol (STP)—to run

as separate OS processes that are

protected from each other. This drives

increased system integrity and inherent-

ly protects against DoS attacks.

Process Monitoring and Restart

ExtremeXOS dramatically increases

network availability using process

monitoring and restart. Each independent

OS process is monitored in real time. If a

process becomes unresponsive or stops

running, it can be automatically restarted.

Loadable Software Modules

The modular design of ExtremeXOS

allows the upgrading of individual

software modules, should this be necessary,

leading to higher availability in the network

(see Figure 1).

High Availability Network

Protocols

Ethernet Automatic Protection

Switching (EAPS)

EAPS allows the IP network to provide

the level of resiliency and uptime that

users expect from their traditional voice

network. EAPS is superior to Spanning

Tree or Rapid Spanning Tree protocols

and offers sub-second (less than 50

milliseconds) recovery that delivers

consistent failover regardless of the

number of VLANs, network nodes or

network topology. Since EAPS allows the

network to recover almost transparently,

Voice-over-IP calls will not drop and digital

video feeds will not freeze or pixelize in

most situations.

Spanning Tree/Rapid Spanning

Tree Protocols

The Summit X450a series supports

Spanning Tree (802.1D), Per VLAN

Spanning Tree (PVST+), Rapid Spanning

Tree (802.1w) and Multiple Instances of

Spanning Tree (802.1s) protocols for

Layer 2 resiliency.

Software-Enhanced Availability

Software-enhanced availability allows

users to remain connected to the network

even if part of the network infrastructure

is down. The Summit X450a series

continuously checks for problems in the

uplink connections using advanced Layer 3

protocols such as OSPF, VRRP and ESRP

(ESRP supported in Layer 2 or Layer 3),

and dynamically routes trafﬁc around the

problem.

Equal Cost Multipath

Equal Cost Multipath (ECMP) routing allows

uplinks to be load balanced for performance

and cost savings while also supporting

redundant failover. If an uplink fails, trafﬁc

is automatically routed to the remaining

uplinks and connectivity is maintained.

Link Aggregation (802.3ad)

Link aggregation allows trunking of up to

eight links on a single logical connection,

for up to 20 Gigabits per Second (Gbps) of

redundant bandwidth per logical connection.

system reboot. Summit X450a provides the high network availability required for converged applications.

5027-02

• Processes are monitored

and can be restarted or

other action taken if

necessary

• Hitless failover

infrastructure for dual

management systems

and stacking

BGP OSPF

SSH-2

V1.3.1

SSH-2

V1.3.2

Third

Party

Application

ExtremeXOS

Kernel

Kernel Loadable

Module

Memory protected

processes under

real-time

scheduling that

cannot impact

each other nor

kernel

Designed to allow

application

modules to be

upgraded during

runtime

Application

modules can be

added during

runtime

Figure 1: ExtremeXOS Modular Design

• Single management point for up to eight units

• High-speed 40 Gbps stacking

• Rapid Failover for converged applications

• Can mix Summit X250e, Summit X450 series

and Summit X650 series switches

5251-01

VIM1-SummitStack

Figure 2: SummitStack Stacking Architecture

Voice-Grade Stacking with

SummitStack

The Summit X450a series offers dual

stacking interfaces to provide high-speed

40 Gbps stacking bandwidth. SummitStack

stacking architecture is designed to

support converged services such as VoIP

and video by its highly available, rapid

failover capability with n-1 master

redundancy, distributed Layer 2 and

Layer 3 switching, link aggregation across

the stack and distributed uplinks.

SummitStack supports up to eight units in

a stack, and the mixture of the units can

be Summit X250e, Summit X450e,

Summit X450a, Summit X480 and

Summit X650 switches. It provides

sub-second failover for path failure and

hitless master/backup failover along with

hitless protocol support such as OSPF

graceful restart and Network Login user

authentication. The Summit X450a

switch provides chassis-like management

and availability with its SummitStack

stacking technology (see Figure 2).

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