You have a network that is more than 7 hops diameter? Wow!
In principle, you should be able to set your timers to cope with a diameter greater than 7 hops. The "root" macro will not help you wih more than 7 hops - you will have to do the calculations yourself.
But it will converge at snails-pace. Frankly I would urge you to reconsider your design if you have a layer-2 that spans more than 7 hops.
I wonder if there is a misunderstanding here. Do do mean hops-in-a-line and not total switches, don't you?
Let me try to put my thaughts.If you have a core switch and connected to this switch are 10 switches so each switch has one connection to the core switch this is a diameter of 1.
It's not the number of switches it's how the are connected. So
core switch -> switch1 -> switch2 -> switch3.
If you have switches connected in the above fashion then your diameter is 3. Does your topology goes 7 line above?
With IEEE 802.1d,recommended consideration when designing the network with STP is not more than 7 hops. On the default timer parameters STP is expected to work fine till 7 hops. Beyond 7 hops the STP will work but it might bit a little hard to predict the behaviour of the STP, which might result in a lots of network problems. From an individual switch perspective like from the root bridge the STP diameter should not be more than 7 hops away.
If you are following Cisco's 3-tier hierarchical design you will never be exceeding the STP diameter.
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