Actually, most newer revisions of Dot1Q support PVST as well.
Rik
""ciscosis"" <[EMAIL PROTECTED]> wrote in message
001301c0b3b7$aba8b000$593d839b@nes2s50667">news:001301c0b3b7$aba8b000$593d839b@nes2s50667...
> ISL has a number of advantages over dot1q, for example it supports per
vlan
> spanning tree (PVST) which allows a separate spantree instance per Vlan
> which makes networks more scalable and more stable than dot1q based.
>
> It is Cisco proprietary but it interoperates with dot1q (common spanning
> tree) compliant switches (using Cisco protocol PVST+)
>
> If you are building a large cisco switched network with alot of Vlans and
> are worried about issues such as spanning tree convergence/ stability
> /reliability .. definately go for ISL
>
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