From: CCIE To Be (ccie.tobe81@gmail.com)
Date: Sat Jan 10 2009 - 17:22:32 ARST
Yes, I mis understood and thaught that VLAN 1 is also considered as default
vlan.
Now let suppose VLAN 1 is not being used in the network for data traffic but
it is being used by switches for propagating self generated traffic (
STP,VTP etc ). So it should be included now in odd vlan list ?
THANKS
On Sat, Jan 10, 2009 at 10:31 PM, Anthony Sequeira <
asequeira@internetworkexpert.com> wrote:
> Sorry if I confused you here. . .
>
> I brought up the Default VLANs in my post when you had not. The default
> VLANs on the switches are VLANs 1002-1005. These are Cisco defaults for FDDI
> and Token Ring and they cannot be deleted. There is also the issue of VLAN 1
> (named default).
>
> In the exam, if I am asked to manipulate all odd VLANs - I go ahead and
> include 1, 1003, and 1005. If I am asked only to manipulate the odd VLANs I
> am actually using - it will certainly exclude 1003 and 1005. I would then
> want to look over the lab scenario to see if I am using VLAN 1 or not. If
> VLAN 1 is used, go ahead and include it.
>
> As a security best practice in the real world - VLAN 1 is eliminated from
> use. Obviously the lab exam might not reflect this however.
>
> Anthony J. Sequeira, CCIE #15626, CCSI #23251
> Senior CCIE Instructor
>
> asequeira@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> Toll Free: 877-224-8987
> Outside US: 775-826-4344
>
> On Jan 10, 2009, at 1:03 PM, CCIE To Be wrote:
>
> Hi,
>>
>> If I am getting this right , you are saying that we should NOT include
>> default vlan if task is asking for specific vlans being used in topology.
>> If
>> task is asking in general ( ALL VLANs ) then we should include default
>> vlan
>> ??
>>
>> On Sat, Jan 10, 2009 at 7:36 PM, Anthony Sequeira <
>> asequeira@internetworkexpert.com> wrote:
>>
>> This is an area where I believe we tend to think too much. I can
>>> remember
>>> being freaked out about the Default VLANs in a question like this and
>>> what
>>> to do about them. The proctor at RTP let me know at the time that I was
>>> just
>>> worrying too darn much.
>>>
>>> If I am asked to make the switch the root for the odd numbered VLANs - I
>>> include ALL odd numbered VLANs (except the default VLANs) and I move on.
>>> I
>>> suppose it would be a bit trickier if it was specified to do this for all
>>> VLANs used in your particular Lab paper. Now I am implementing the
>>> command
>>> just for the VLANs we use and I am being sure to catch any that might be
>>> created outside of the Switching section.
>>>
>>> Anthony J. Sequeira, CCIE #15626, CCSI #23251
>>> Senior CCIE Instructor
>>>
>>> asequeira@internetworkexpert.com
>>>
>>> Internetwork Expert, Inc.
>>> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/><http://
>>> www.internetworkexpert.com/>
>>> Toll Free: 877-224-8987
>>> Outside US: 775-826-4344
>>>
>>>
>>> On Jan 10, 2009, at 5:31 AM, CCIE To Be wrote:
>>>
>>> Dear Group,
>>>
>>>>
>>>> If I have a requirement to make one switch e.g SwitchA 'root' for odd
>>>> vlans
>>>> and other switch SwitchB 'root' for even switch. My question is that, do
>>>> I
>>>> need to INCLUDE VLAN 1 in the odd vlan list while making a switch
>>>> primary
>>>> for odd vlans ??
>>>>
>>>> If we talk about 'allowed vlan' on trunk then it is clear that we don't
>>>> need
>>>> to INCLUDE VLAN 1 in allowed vlan list because its a system vlan and
>>>> STP,
>>>> VTP etc traffic will be passed across the trunks even VLAN 1 is not
>>>> implicitly included in allowed vlan list. What about above scenario ?
>>>>
>>>>
>>>> Thanks
>>>>
>>>>
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>>>
>>
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