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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