cisco three layer hierachical model

<div> cisco three layer hierachical model</div> <div> -high scalability</div> <div> -easy for troubleshooting</div> <div> &nbsp;</div> <div> Three layer</div> <div> -Access layer&nbsp;</div> <div> -Distribution layer (aggregation layer)</div> <div> -core (backbone layer)</div> <div> &nbsp;</div> <div> *pc ,phones , printers , wireless access point are connected to access layer</div> <div> -stp is start here</div> <div> -mainly compose of layer 2 ethernet switches</div> <div> &nbsp;</div> <div> Offer service :</div> <div> -broadcast domain segmentation</div> <div> -Qos(marking,policing,etc.)</div> <div> -security (802.1x,port security,DAI,etc)</div> <div> -Multicast traffic management (IGMP snooping)</div> <div> -inline power</div> <div> &nbsp;</div> <div> *access switches are connected to distributed layer</div> <div> -aggregating not only the number of ports but also the bandwidth in the n/w</div> <div> -L3 routing , HSRP , VRRP&nbsp;</div> <div> &nbsp;</div> <div> offer service:</div> <div> -aggregate access layer switch (combining higher b/w)</div> <div> -Typically comprised of layer3 switch</div> <div> -Multiple connection to upstream to core and downstream to access</div> <div> -offer service such as HSRP ,GLBP ,VRRP</div> <div> -bandwidth aggregation(Etherchannel,802.3ad)</div> <div> -load balancing</div> <div> -topology summerization (aggregation)</div> <div> &nbsp;</div> <div> &nbsp;</div> <div> &nbsp;</div> <div> *core layer</div> <div> -Backbone of the layer</div> <div> -must be fast and reliable as all other block depend on it</div> <div> &nbsp;</div> <div> &nbsp;</div> <div> offer service:</div> <div> -Wire speed forwarding</div> <div> -fast convergence around a link or node failure</div> <div> -efficient bandwidth utilization</div> <div> &nbsp;</div>

By : | Category : Educational| Date : August 16,2014

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