From: Troy Allen McCarty (troy@xxxxxxxxxxx)
Date: Sun Mar 04 2001 - 01:11:12 GMT-3
My understanding was that the benefit of ISL over dot1q was the per-vlan instan
ce of spanning-tree. Subsequently, dot1q was improved to allow per-vlan instan
ces of spanning-tree; therefore, a Cisco proprietary protocol (ISL) was no long
er needed.
Any comments?
Regards,
Troy McCarty
CCIE #6967
At 08:30 PM 3/3/2001 -0500, you wrote:
>----- Original Message -----
>From: "Chuck Larrieu" <chuck@cl.cncdsl.com>
>> According to the most recent product quick reference guide ( Aug 2000 )
>>
>> The 4003 and 4006 both support 802.1Q
>>
>> Both also support ISL through the Layer 3 module, but apparently not
>without
>> that module in place. ( WS-X4232-L3= )
>>
>> I seem to remember rumblings around work about this "surprise" with a
>major
>> customer / installation one of the groups was working on.
>>
>> Chuck
>>
>
>The layer 3 blade supports ISL on the 2 - Gigabit ports off the front. These
>are the only ports on a Catalyst 4000 that support ISL. The 2 Gigabit ports
>off the back I am not sure of since you are connecting them directly to the
>backplane.
>
>David
>
>David C Prall dcp@dcptech.com http://dcp.dcptech.com
>
>
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