RE: VTP Question

From: Cisco Nuts (cisconuts@hotmail.com)
Date: Thu Nov 10 2005 - 14:57:20 GMT-3

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Good one, Dennis.

Thank you for your explanations!!

Sincerely.

<BLOCKQUOTE style='PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #A0C6E5
2px solid; MARGIN-RIGHT: 0px'><hr color=#A0C6E5
size=1>
From: "Dennis J. Hartmann"
<dennisjhartmann@hotmail.com> Reply-To: "Dennis J.
Hartmann" <dennisjhartmann@hotmail.com> To: "'De
Witt, Duane'" <duane.dewitt@siemens.com>, "'brussels'"
<brussels@yandex.ru>, <Lee.Donald@t-systems.co.uk> CC:
<noble@inserviceindia.com>,
<ccielab@groupstudy.com> Subject: RE: VTP
Question Date: Thu, 10 Nov 2005 09:54:52 -0500 > VTP
transparent is used to "IGNORE" VTP advertisements coming
over >trunk links. As previously discussed, there is NO way to
completely turn >off VTP advertisements unless you filter the MAC
address 01-00-0c-cc-cc-cc. >Be careful with that too! Since CDP, DTP,
etc. also uses this well known >MAC address, you need to know what
Protocol Cisco is using in the SNAP >header this particular
type. > >VTP packets are sent in either ISL frames or in dot1q
frames. These packets >are sent to the destination MAC address
01-00-0C-CC-CC-CC with a Logical >Link Control (LLC) code of
Subnetwork Access Protocol (SNAP) (AAAA) and a >type of 2003 (in the
SNAP header). This is the format of a VTP packet >encapsulated in ISL
frames: > >From: >http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080>>094c52.shtml > > >Sincerely, >Dennis
J. Hartmann >White Pine
Communications >dh8@pobox.com >CCSI#23402 / CCVP / CCIP /
CCNP >Cisco Optical, VPN & IDS
Specialist >MCSE > > >-----Original
Message----- >From: De Witt, Duane
[mailto:duane.dewitt@siemens.com] >Sent: Thursday, November 10, 2005
5:55 AM >To: Dennis J. Hartmann; brussels;
Lee.Donald@t-systems.co.uk >Cc: noble@inserviceindia.com;
ccielab@groupstudy.com >Subject: RE: VTP Question > >Hi
All > >Is VTP v1 and transparent mode really required to prevent
VTP packets from >leaving certain ports? I've always just set the
ports to switchport mode >access since VTP can only run on trunks. Or
is this only required to stop >the VTP packets over trunks as
well? > >-----Original Message----- >From:
nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of >Dennis J. Hartmann >Sent: 10 November 2005 02:24
AM >To: 'brussels'; Lee.Donald@t-systems.co.uk >Cc:
noble@inserviceindia.com; ccielab@groupstudy.com >Subject: RE: VTP
Question > > Version 1 is the default. I wanted to make sure
everyone knows that >because this is not clear when using the show vtp
status command. This >command will show VTP V2 Mode, but next to V2,
it will display Disabled (see >below). > >Switch> show
vtp status >VTP Version : 2 >Configuration Revision :
0 >Maximum VLANs supported locally : 1005 >Number of existing
VLANs : 5 >VTP Operating Mode : Server >VTP Domain Name
: >VTP Pruning Mode : Disabled >VTP V2 Mode :
Disabled >VTP Traps Generation : Disabled >MD5 digest : 0xBF
0x86 0x94 0x45 0xFC 0xDF 0xB5 0x70 Configuration last >modified by
0.0.0.0 at 0-0-00 00:00:00 Local updater ID is 172.20.135.196
on >interface Vl1 (lowest numbered VLAN interface
found) > > >Sincerely, >Dennis
Hartmann > >-----Original Message----- >From:
nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of >brussels >Sent: Tuesday, June 07, 2005 6:26 AM >To:
Lee.Donald@t-systems.co.uk >Cc: noble@inserviceindia.com;
ccielab@groupstudy.com >Subject: RE: VTP Question > >This
is not enough. All lab scenarios for training have trunk ports
(either >two trunks or one ether-channel) and therefore VTP packets
will be sent out >and recieved on some ports. > >The
solution is to set VTP mode to transparent and version 1. (V2 VTP
switch >transparently forwards VTP packets, while V1
doesn't) > > >Noble, > > > >I would deduce
from this question that it wants to change each port to >
>"switchport Access" mode so that VTP frames are not sent out,
by > >default all ports will be dynamic. > > >
>Regards > > > >Lee. > > > > >
> > >-----Original Message----- > >From: T. N. Noble
[mailto:noble@inserviceindia.com] > >Sent: 07 June 2005
10:51 > >To: ccielab@groupstudy.com > >Subject: VTP
Question > > > >Hello Group, > > > >Can
anybody help me to understand the following question correctly? >
> > >"Restrict the VTP Traffic from reaching all the 24
fast Ethernet ports > >of the switch". Is this question
talking about VTP Pruning? I > >understand that the VTP pruning is
related to Trunks where as here the > >switch ports are in Access
Mode. > > > >Thanks, > > >
>Noble > > >
>_______________________________________________________________________ >
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