Re: VTP

From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Sat Apr 19 2008 - 10:35:28 ART

FTR:

   Version-Dependent Transparent Mode--In VTP version 1, a VTP
   transparent switch inspects VTP messages for the domain name and
   version, and forwards a message only if the version and domain name
   match. Since only one domain is supported in the Catalyst 5000 series
   software, VTP version 2 forwards VTP messages in transparent mode,
   without checking the version.

So if the TRANSPARENT switch is in version 1, it only forwards same
domain version 1 vtp messages, but if it is in version 2, it forwards
vtp messages of any domain/version.

-Carlos

Luca Hall @ 04/04/2008 20:47 -0300 dixit:
> yep meant vtp info.
>
> if you change the vtp domain of the transparent switch that the vtp info
> is crossing to a different domain from what it is sent from it wont be
> forwarded anymore is what I should have said...
>
>> Why would it stop forwarding the vlans ?
>> May be you meant "forwarding VTP info about vlans" ?
>> -Carlos
>>
>> Luca Hall @ 04/04/2008 20:05 -0300 dixit:
>>> If they all know the same vlans and you change to whatever vtp mode it
>>> wont change the vlans and they will be forwarded, if you change the vtp
>>> domain
>>> on the transparent switches they will stop forwarding the vlans.
>>>
>>>
>>>
>>>> So basically is it safe to assume that regardless of the VTP version on
>>>> the 4 switches I can change a single switch or rather 3 of the from
>>>> client/server to transparent thus leaving one as server and it won't
>>>> mess up my VLAN settings?
>>>>
>>>> Thanks
>>>> -----Original Message-----
>>>> From: Gary Braver [mailto:gbraver@fastlanenetworks.com]
>>>> Sent: Friday, April 04, 2008 2:51 PM
>>>> To: 'Carlos G Mendioroz'; Athaide, Dwayne
>>>> Cc: 'groupstudy'
>>>> Subject: RE: VTP
>>>>
>>>> I painfully went through this.
>>>>
>>>> Your switch is in client mode. It has vlans automatically stored in
>>>> the
>>>> vlan.dat file (received from the server).
>>>>
>>>> You change the connection to vtp mode transparent.
>>>>
>>>> Transparent mode can have vlans defined in the config or through the
>>>> vlan database. Since the vlan database exists the vlans will be loaded
>>>> from the vlan.dat file
>>>>
>>>> You reboot and the vlan.dat file is still there. You can even do a
>>>> write erase and the vlan.dat file will still be there.
>>>>
>>>> Wither later revisions of IOS You can delete the vlan.dat file and
>>>> enter
>>>> all vlan info in the config directly. Believe the vlan info will still
>>>> be stored in the vlan.dat file but since all vlan config is in the main
>>>> config you could take the config to a new identical switch / replace
>>>> the
>>>> switch without loosing all the vlan info.
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>>>> Carlos G Mendioroz
>>>> Sent: Friday, April 04, 2008 1:07 PM
>>>> To: Athaide, Dwayne
>>>> Cc: groupstudy
>>>> Subject: Re: VTP
>>>>
>>>> Dwayne,
>>>> inline:
>>>>
>>>> Athaide, Dwayne @ 03/04/2008 10:57 -0300 dixit:
>>>>> I had asked a similar question pertaining to a scenario but did not
>>>> get
>>>>> a response so I am going to generalize the question .
>>>>>
>>>>>
>>>>>
>>>>> I have 4 switches SW1 (S)-SW2(S)-SW3(T)-SW4(S). All switches are
>>>>> trunked and belong in the same VTP domain.
>>>>>
>>>>>
>>>>>
>>>>> SW1, SW2, SW4 are Server
>>>>>
>>>>> SW3 is a Transparent switch.
>>>>>
>>>>>
>>>>>
>>>>> SW1(S)---Trunk-----SW2(S)----Trunk ------SW3(T)-------Trunk----SW4(S)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Now say to start off all switches have VLAN's 1 thru 10. The switches
>>>>> are running VTP version 1. And VTP pruning is enabled.
>>>>>
>>>>>
>>>>>
>>>>> 1. Now say I build a new VLAN on SW1. Will that VLAN be
>>>>> propagated to Switch SW4.?
>>>>>
>>>>>
>>>>>
>>>>> My Answer :When I lab this up it did get propagated and this confused
>>>> me
>>>>> as I was under the impression that Version 1 VTP on a transparent
>>>> switch
>>>>> will not propagate the VLAN only VTP version 2 would.
>>>> AFAIK, main difference between v1 & v2 is token ring support.
>>>> Transparent should enable VTP to pass through, as it does according to
>>>> your lab.
>>>>
>>>>> 2. Say I have a Router A connected to Access port VLAN 10 on SW3
>>>>> and a routed port on SW2 . Should Router A be able to ping Router B
>>>> &
>>>>> vice versa thru the transparent switch?
>>>>>
>>>>>
>>>>>
>>>>>
>>>> RA-(VLAN10)------SW3----------Trunk----------------SW4(Vlan10)----------
>>>>> ----Routed port(SW2)
>>>>>
>>>>>
>>>>>
>>>>> I can although when I do a show int trunk on SW4 I show VLAN 10 to be
>>>>> pruned.
>>>> Typo here ? You say "router port on SW2" and draw SW4.
>>>> If it is in SW2, prunned at SW4 will have no effect.
>>>> Also, prunning stops broadcast only, so if you ping from the prunned
>>>> side, you will lift the bann, so to say .
>>>>
>>>> -Carlos
>>>>
>>>>>
>>>>>
>>>>> Thanks
>>>>>
>>>>>
>>>> _______________________________________________________________________
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>>>>>
>>>> --
>>>> Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
>>>>
>>>> _______________________________________________________________________
>>>> Subscription information may be found at:
>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>
>>>> _______________________________________________________________________
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>>>> http://www.groupstudy.com/list/CCIELab.html
>>> _______________________________________________________________________
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>>>
>> --
>> Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
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> http://www.groupstudy.com/list/CCIELab.html
> 

-- 
Carlos G Mendioroz  <tron@huapi.ba.ar>  LW7 EQI  Argentina

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