switch hierarchical design

[samuel0901]

Hi,

If switch hierarchical design as the attachment.

what is problem will be occurred?

Thanks!

Samuel

[IWAN HOOGENDOORN]

If you spanning tree is configured well I don't see a problem...

What exactly are you aiming at?

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#Iwan Hoogendoorn

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[samuel0901]

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?

Thanks!

Samuel

[jdevoll]

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]

hi jdevoll,

right, it is stp diameter problem.

how to check whether some wrong if diameter exeeed 7?

Thanks!

Samuel

[carl_townshend]

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

cheers