Carmelo,
You might want to double check trunking support on that cat 4000. Some
models do not support ISL and only have Dot1Q support.
Regardless, it would be better to only have one trunking type on the
network, if only for troubleshooting purposes.
Hope this helps,
Karen
*********** REPLY SEPARATOR ***********
On 5/9/2001 at 5:45 PM 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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