Re: VTP

From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Sat Apr 19 2008 - 11:27:15 ART

It might be that it is dependent on sw architecture.
I tested this using a 2900. I'll test it again whenever I can get a hold
of some 35xx.

-Carlos

Carlos Trujillo @ 19/04/2008 11:21 -0300 dixit:
> Carlos.
>
> Im trying the same config you mention, but it doesnt work for me, any
> suggestion whats going on?
>
>
> [SW1]---------[SW2]---------[SW3]-------[SW4]
>
> SW1, SW2, SW4 belong to the vtp domain INTERNETWORKEXPERT.
> SW3 belong to the vtp domain NETMASTERCLASS, and its in transparent mode.
>
> I enable VTP version 2 in SW3, and then I create some vlans in SW1, but
> those vlans are not propagated to SW4. they are only propagated to SW2.
> As SW3 is in another vtp domain, It is not propagating the vlans from
> another vtp domain, While It is in version 2 enabled, and in transparent
> mode.
> Do your comments apply also to Catalyst 3550 and 3560 switches?
>
> A solution I Think, that comes my maind to solve to vlan propagation
> from sw1 and sw2 to sw4 is to make a dot1q tunnel, in sw3 trunk
> interfaces, encapsulating also vtp messages. I tested It and I can
> succesfully get vlans propagated from sw2 to sw4 crossing sw3.
>
> Now when I do this solution, SW3 trunk interfaces becomes vlan access
> ports of the dot1q tunnel, where sw3 is loosing its trunk connections.
>
>
>
>
>
>
> 2008/4/19, Carlos G Mendioroz <tron@huapi.ba.ar <mailto:tron@huapi.ba.ar>>:
>
> 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
> <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>
> [mailto: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
> <mailto:tron@huapi.ba.ar>> LW7 EQI Argentina
>
> _______________________________________________________________________
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>
> _______________________________________________________________________
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> _______________________________________________________________________
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> --
> Carlos G Mendioroz <tron@huapi.ba.ar
> <mailto:tron@huapi.ba.ar>> LW7 EQI Argentina
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> _______________________________________________________________________
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>
>
> --
> Carlos G Mendioroz <tron@huapi.ba.ar <mailto:tron@huapi.ba.ar>>
> LW7 EQI Argentina
>
>
> Pass the CCIE in six weeks, Guaranteed!
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>
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>
>
> 

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

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