Re: VTP question

It is quite confusing. When you looking at the link below:

http://www.cisco.com/en/US/partner/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml#ustand
Summary Advertisements

By default, Catalyst switches issue summary advertisements in five-minute
increments. Summary advertisements inform adjacent Catalysts of the current
VTP domain name and the configuration revision number.

*When the switch receives a summary advertisement packet, the switch
compares the VTP domain name to its own VTP domain name. If the name is
different, the switch simply ignores the packet. If the name is the same,
the switch then compares the configuration revision to its own revision. If
its own configuration revision is higher or equal, the packet is ignored. If
it is lower, an advertisement request is sent.*

Regards,

KG

On Fri, Sep 30, 2011 at 12:24 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> I guess it depends on the VTP version ?
> And on which client is involved. old CAT switches could never do such
> thing because clients had no memory :)
>
> -Carlos
>
> Piotr Matusiak @ 30/09/2011 06:20 -0300 dixit:
>
>> Switch in VTP Client mode can overwrite Server's VLAN database.
>>
>> Check this out:
>> http://www.cisco.com/en/US/**partner/tech/tk389/tk689/**
>> technologies_tech_note091<http://www.cisco.com/en/US/partner/tech/tk389/tk689/technologies_tech_note091>
>> 86a0080890613.shtml#topic7
>>
>> and this if you have CCO account:
>> http://www.cisco.com/warp/**customer/473/vtp_flash/<http://www.cisco.com/warp/customer/473/vtp_flash/>
>>
>> Regards,
>> --
>> Piotr Matusiak
>> CCIE #19860 (R&S, Security), CCSI #33705
>> Technical Instructor
>> website: www.MicronicsTraining.com <http://www.micronicstraining.**com/<http://www.micronicstraining.com/>
>> >
>>
>> blog: www.ccie1.com
>>
>> If you can't explain it simply, you don't understand it well enough -
>> Albert Einstein
>>
>>
>> 2011/9/30 Kgabo Seopa <kgabo.seopa_at_gmail.com>
>>
>> Hi,
>>>
>>> I stand to differ.
>>>
>>> If a new switch has been introduced into the domain with a client mode,
>>> it
>>> will never corrupt the domain at all.
>>>
>>> The reason is, when in client mode
>>>
>>> (1) It does not generate the summary advertisements for every time period
>>> (5
>>> min) - so, its reversion number will not be known on the domain
>>> (2) When the switch receives a lower configuration reversion number
>>> compared
>>> to its current, it simply ignore and drop the packet - thus, without
>>> forwarding it to any trunk on the domain.
>>>
>>> How will it then corrupt the domain.
>>>
>>> Regards,
>>> KG
>>> CCIE#30089
>>>
>>> On Fri, Sep 30, 2011 at 2:20 AM, Marko Milivojevic <markom_at_ipexpert.com
>>>
>>>> wrote:
>>>> Yes, unless passwords are different.
>>>>
>>>>
>>>> --
>>>> Marko Milivojevic - CCIE #18427 (SP R&S)
>>>> Senior Technical Instructor - IPexpert
>>>>
>>>> On Wed, Sep 28, 2011 at 23:27, Nick Jay <wanttobeccde_at_yahoo.com> wrote:
>>>>
>>>>> If a new switch is added in a network, With higher revision number,same
>>>>>
>>>> domain
>>>>
>>>>> name but in "CLIENT" mode.. Will it harm the network by flushing the
>>>>>
>>>> vlan
>>>
>>>> information of the existing network?
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
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>>
>>
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>>
>>
>>
>>
>>
>>
>>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

Blogs and organic groups at http://www.ccie.net
Received on Fri Sep 30 2011 - 13:58:14 ART