Intro to Scaling Networks

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fIntro to Scaling Networks

hierchical network design

has three disticnt layers: core distribution and access layer.

Cisco enterprise architectuire mosudles

enterprise campus

enterprise edge

service provider edge

remote

Failure domains_ areas of a network that are impacted when a important device goes down or encounters a problem

reducing failire domains decreases the chance of loosing connectivity to a network (fault tolerance) ______ also simplifies troubleshooting

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Designing for Scalability

Use modular equipment

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designing for reduntancy

install duplicate equipment

provide reduntant paths

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Expanding the Network

increasing bandwidth

link aggregation- incresing the amout of bandwidth netween devices by creatung one logical lim made up of several physical linkd

cisco's term for this is EtherChannel.. this is a form of link aggreacgation used in switched networks

expanding access layers

this can be done by using wireless connectivity

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switch hardware

switch platforms

fixed

modular- ussually at the core and distribution layers

stackable

non stackable

Vss (virtual swithcing system)- catalyst 6500 switches....they can be in separate locations and once on the same network can be seen as one switch.. devices on the switches can be seen on the remote switch...

Port density

Number of available ports...

this is determined by the # of connects that is needed in a particualr area

SFP--Small form fator pluggables

forwarding rates of a switch

It is ver important to know the backplane capabilities of a switch. For example, 24 Gbps switch should be able process 24 Gbps when all ports are being used

an auxiliary port (out of band connection)--- situation where an auxiliary port would be advantageous when the device is in a remote location and in band connection is not available.