Re: Significance of Native Vlan

Got the answer. Scott Morris explained,

https://learningnetwork.cisco.com/message/40701

On Sat, Nov 21, 2009 at 7:36 PM, S Malik <ccie.09_at_gmail.com> wrote:

> I think if ST is enabled and native vlan mismatch is detected then it will
> put the port in inconsistant mode (please double check).
>
>
> On Sat, Nov 21, 2009 at 6:40 PM, Rick Darsey <rdarsey_at_gmail.com> wrote:
>
>> I am new here, so if this makes no sense, please excuse it.
>>
>> I am not clear on the correlation between ST and native VLAN in your
>> question. Is the Spanning Tree, or DTP?
>>
>> Rick
>>
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of S
>> Malik
>> Sent: Saturday, November 21, 2009 5:09 PM
>> To: Babatunde Sanda
>> Cc: Cisco certification
>> Subject: Re: Significance of Native Vlan
>>
>> Sanda ,
>> Thanks for the response. In fact I just wanted to know the significance
>> of
>> native vlan when "sw mode trunk" and "sw trunk allowed vlan" is configured
>> and one end has ST disabled on the trunk interface. One end is Cisco and
>> other end Dell.
>>
>> I can see trunk forwarding the traffic while interface is in trunking mode
>> and native vlans on two ends are different.
>>
>>
>>
>> On Sat, Nov 21, 2009 at 10:55 AM, Babatunde Sanda
>> <sbabatunde1_at_ca.rr.com>wrote:
>>
>> > Native vlan is used to carry untagged packets. When you create a vlan
>> the
>> > number of the vlan becomes the tag and it travels with the packets from
>> > switch to switch. By default on most vendor switches vlan 1 is the
>> native
>> > vlan. You can make the native vlan anything you want but you must have
>> > this
>> > configuration "SWITCHPORT TRUNK NATIVE VLAN (VLAN NUMBER)" on your trunk
>> > ports for untagged packets to be carried.
>> >
>> > Spanning tree umm! That will require some reading on your part but
>> simply
>> > put spanning tree is a layer two technology used to prevent loops around
>> > the
>> > network. There are different types /modes. Depending on the type of
>> > spanning tree you have implemented that will determine if you have a
>> > "blocked port" or "alternate port" status. Either ways you can still
>> > disable spanning tree on a port (caveat this might prevent loops from
>> being
>> > detected on your network). "spanning portfast" can do this on an access
>> > port. You can also disable it on a trunkport with the spanning tree
>> point
>> > to point configuration.
>> >
>> >
>> > Spanning tree implementation requires planning on your part and knowing
>> > your
>> > network topology well.
>> >
>> >
>> > -----Original Message-----
>> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> S
>> > Malik
>> > Sent: Saturday, November 21, 2009 6:46 AM
>> > To: Cisco certification
>> > Subject: Significance of Native Vlan
>> >
>> > All,
>> > If two switches configured for "switchport mode trunk" & " sw trunk
>> encap
>> > dot1q" and spanning is disabled on one end of the trunk, then what is
>> the
>> > significance of Native Vlan?
>> >
>> >
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>> >
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>>
>>
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>>
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Received on Sat Nov 21 2009 - 19:46:33 ART