Re: VTP question

Hi,

Everything is fine with this statement. You're probably getting it wrong.
This statement describes behavior of a switch receiving VTP Summary message.
If the switch has higher (or equal)revision number than it is in the Summary
Advertisement it ignores it. However, in case the revision number is higher
in the Summary Advertisement, the switch sends out Advertisement Request
which is another VTP message to get VLAN information from neighboring
switch.

Regards,

--
Piotr Matusiak
CCIE #19860 (R&S, Security), CCSI #33705
Technical Instructor
website: 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>
> It is quite confusing. When you looking at the link below:
>
>
>
>
http://www.cisco.com/en/US/partner/tech/tk389/tk689/technologies_tech_note091
86a0080094c52.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/ <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