Spanning-Tree

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is there a maximum number of switches, or effective-radius, in which spanning-tree can work effectively ?

and exceeding that number would cause spanning-tree to buckle under the strain and tiiimmmmmbbbbbbbbbbbeeeeeeerrrrrrrrrrrrrrr
and then the dreaded broadcast storm crashes your network ??

 

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In IEEE 802.1D the radius should be default not exceed more than 7 switches

In IEEE 802.1W the radius should not exceed more than 20.

I have tried to exceed both with interesting results.

The problem with exceeding the recommend radius is not fear of the broadcast storm but convergence issues in electing the root bridge, this will stop any user traffic rather than propagate it in a loop

 

thats exactly what I was after - excellent stuff

thanks Joe