You did not mention it, but I assume you have sub interfaces with ISL
encapsulation on
the routers , the same as the VLAN os the switches..
What happens when you do a "sh stan" from each router ?
andyh wrote:
> if you have a Cisco-only switch architecture I would use ISL between the
> Catalysts - per-vlan STP is *VERY* useful for resilience and load-balancing
> purposes.
>
> I would use dot1q for attached servers where necessary - since they are
> end-stations there is not the requirement for them to participate int STP.
>
> my #0.02 (is 0.02 UK pounds worth more than $0.02?)
>
> Andy
>
> > >
> > >Hi Guys,
> > >i have a question for you.
> > >
> > >In my site i have to project a new network architecture.
> > >
> > >I would organize the Resource human in V-LAN. Of course all V-LAN have
to
> > >access some services (example DNS, E-Mail, Domain Controller etc. etc)
> and
> > >not others.
> > >
> > >The NIC interfaces of my servers permit the 802.1Q encapsulation.
> >
> > Ensure that the host does not route between the VLANs, as this kills your
> > security policy.
> >
> > >I would make the TRUNK between switches (Catalyst 4000 - access Layer
and
> > >Catalyst 6500 -Core Layer) with ISL trunk.
> >
> > Why not just use dot1q?
> >
> > >Can i map the 802.1Q trunk on ISL trunk? And how could i do this ?
> >
> > No, they are similar products, but IIRC some switches support both
> products,
> > so you could use ISL on one trunk, and dot1q on another.
> >
> > >Please indicate me link where i can find a example of this configuration
> ?
> >
> > I would recommend dot1q everywhere.
> >
> > >Regards, Carmelo
> >
> > Rob./
> >
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