From: MADMAN (dmadlan@qwest.com)
Date: Fri Sep 12 2003 - 17:34:13 GMT-3
I know I have both encap types on the same swithes in the lab and
some customers have both encaps, ISL from legacy days and 802.1q cause
some platforms only support dot1q.
I can't honestly say I recall a setup as you describe but I think it
would work. Would I do this for a customer, no.
HTH
Dave
ccie2be wrote:
> Hey Dave,
>
> Thanks for getting back to me.
>
> Are either of the below scenarios, scenarios that you've actually
> implemented and know from 1st hand knowledge?
>
> If you were able to implement the 1st scenario, did you do any vlan load
> balancing between the 2 switches, for example, make sw1 the root for vlan
> 1,3, and 5 and make sw2 the root for vlan 2,4, and 6.
>
> Also, I've got one more interesting scenario regarding VTP and trunking.
>
> Sw1 -----ISL trunk------router--------802.1q trunk----------Sw2
>
> Assume Sw1 is a VTP server and Sw2 is a VTP client. On the router, the 2
> fast ethernet interfaces are bridged together. Q? Do VTP frames transit
> the router from Sw1 to Sw2 and enable Sw2 to be in the same VTP domain as
> Sw1?
>
> Q? If this doesn't work when the 2 trunks are different, like above, will
> it work if the 2 trunks are ISL? 802.1q?
>
> As you say, in a production network, it would be better for both trunks to
> be the same, but Cisco doesn't care about that in the lab.
>
> dt
>
>
> ----- Original Message -----
> From: "MADMAN" <dmadlan@qwest.com>
> To: "ccie2be" <ccie2be@nyc.rr.com>
> Cc: "Group Study" <ccielab@groupstudy.com>
> Sent: Friday, September 12, 2003 12:57 PM
> Subject: Re: VTP and ISL and 802.1q trunks
>
>
>
>> no though I tend to use 802.1q, try to keep configs consistant.
>>
>> Dave
>>
>>ccie2be wrote:
>>
>>
>>>Hi,
>>>
>>>Are there any problems or issues when both ISL and 802.1q trunks are
>
> used in
>
>>>the same VTP domain?
>>>
>>>For example, suppose the following:
>>>
>>> ----ISL trunk --------
>>>Sw1 Sw2
>>> ----802.1q trunk----
>>>
>>>Is the above a valid configuration? If so, do any special precautions
>
> need to
>
>>>be taken related to STP or VTP because one trunk is ISL but the other
>
> one is
>
>>>802.1q?
>>>
>>>
>>>Example 2: Assume Sw1 is VTP server and sw2 and sw3 are VTP clients all
>
> in
>
>>>the same VTP domain.
>>>
>>>
>>>Sw1----ISL trunk--------Sw2-------802.1q trunk--------Sw3
>>>
>>>Is this a valid configuration? Any gotcha's I need to be aware of?
>>>
>>>I know that these aren't preferred configs but the Cisco lab is reputed
>
> to
>
>>>test valid config's even if they're not good config's.
>>>
>>>Thanks, dt
>>>
>>>
>>>_______________________________________________________________________
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>>
>>--
>>David Madland
>>CCIE# 2016
>>Sr. Network Engineer
>>Qwest Communications
>>612-664-3367
>>
>>"Emotion should reflect reason not guide it"
>>
>
>
>
-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"Emotion should reflect reason not guide it"
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