From: Carlos Trujillo (carlos.trujillo.jimenez@gmail.com)
Date: Sat Apr 19 2008 - 11:21:54 ART
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>:
>
> 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
> > > > > >
> > > > > >
> > > > > >
> > > > > _______________________________________________________________________
> > > > >
> > > > > > Subscription information may be found at:
> > > > > > http://www.groupstudy.com/list/CCIELab.html
> > > > > >
> > > > > > --
> > > > > Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
> > > > >
> > > > >
> > > > > _______________________________________________________________________
> > > > > Subscription information may be found at:
> > > > > http://www.groupstudy.com/list/CCIELab.html
> > > > >
> > > > >
> > > > > _______________________________________________________________________
> > > > > Subscription information may be found at:
> > > > > http://www.groupstudy.com/list/CCIELab.html
> > > > >
> > > >
> > > > _______________________________________________________________________
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> > > >
> > > > --
> > > Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
> > >
> > >
> > > _______________________________________________________________________
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> > >
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> --
> Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
>
>
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