switch hierarchical design

Unanswered Question
Feb 27th, 2007


If switch hierarchical design as the attachment.

what is problem will be occurred?



I have this problem too.
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samuel0901 Thu, 03/01/2007 - 04:50

i think switch should be within 3 layers, i.e. core, distribution, access layer. if it is more than 3 layers. it should has problem, but i forgot what's wrong. Does anyone can talk me what it is?



jdevoll Thu, 03/01/2007 - 13:20

The purpose of the hierarchical model is to accommodate performance requirements, and to set clear functional boundaries for services in you LAN. Cisco's model is the 3 tier model, therefore it is the most widely used. This is not a hard rule, but it certainly is time tested. The only hard and fast rule is that STP diameter should not exceed 7 switches, and you can even circumvent that (highly ill advised).

samuel0901 Fri, 03/02/2007 - 07:36

hi jdevoll,

right, it is stp diameter problem.

how to check whether some wrong if diameter exeeed 7?



carl_townshend Mon, 03/05/2007 - 09:04

on this also, i would run the spanning tree root at the distribution layer and use layer 3 between that and the core.



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