Maximum depth of a spanning-tree topology

[bnace]

I have a seies of switches connected by 802.1q trunks, each of which share some common Vlans. Is there a maximum depth, i.e. number of switches in series before spanning tree starts failing to converge?

[vmiller]

Generally, a spanning-tree "domain" for lack of a better word should not be greater than 7 from the root bridge.

Its like how may routers in an ospf area.....milage varies..

[bnace]

Thanks for the feedback, this is kind of the answer I

was expecting. It's obvious the deeper the tree the more topology changes ... the more the convergence time, etc.  Somewhere I recall seeing the seven (7) layers and yet I know of series of switches much deeper than 7 that "work". I'm working on a proposed design now with 10 deep and was serching for a limiting factor in the convergence. Thanks for the feedback.