PVST Question

Dear Experts,

I come across a question PVST when I'm reading BCMSN. Here is :

PVST requires the use of ISL Trunking Encap between switches. >> That means
we totally cannot use dot1q trunk if we are running PVST. ????

another notable point is (especially for Open Ended Question) :
In networks where PVST and CST coexist, interoperability problems occur.
Each require a different trunking method, so BPDUs are never exchanged
between STP types. >> It will probably come to us as a tricky question. In
real live network, that mean we cannot run CST and PVST together. ?????

Thanks.

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Received on Mon Jun 22 2009 - 20:06:43 ART