From: Ben (ccieben@cox.net)
Date: Sat Apr 22 2006 - 21:47:34 GMT-3
I had to try it.... I guess I've always 'nailed-up' my trunks so I never
discovered this.
CAT2(config)#vtp domain TPSREPORT
Changing VTP domain name from CCIE to TPSREPORT
CAT2(config)#^Z
CAT2#
9w6d: %SYS-5-CONFIG_I: Configured from console by console
CAT2#
9w6d: %DTP-5-DOMAINMISMATCH: Unable to perform trunk negotiation on port
Fa0/23 because of VTP domain mismatch.
CAT2#
9w6d: %DTP-5-DOMAINMISMATCH: Unable to perform trunk negotiation on port
Fa0/24 because of VTP domain mismatch.
CAT2#show ru int fa0/23
Building configuration...
Current configuration : 98 bytes
!
interface FastEthernet0/23
description to CAT1 fa 0/23
switchport mode dynamic desirable
end
CAT2#show ru int fa0/24
Building configuration...
Current configuration : 98 bytes
!
interface FastEthernet0/24
description to CAT1 fa 0/24
switchport mode dynamic desirable
end
Ben
James Ventre wrote:
> Try it for yourself.
>
> "To autonegotiate trunking, the interfaces must be in the same VTP
> domain. Use the trunk or nonegotiate keywords to force interfaces in
> different domains to trunk. For more information on VTP domains, see
> "Understanding and Configuring VTP."
>
> Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP). DTP
> supports autonegotiation of both ISL and 802.1Q trunks."
>
> http://www.cisco.com/en/US/products/hw/switches/ps663/products_configuration_guide_chapter09186a00800f0d62.html
>
> James
>
> Matt White wrote:
>
> I do not believe that to be correct. For VLAN ID to propagate form a
> server to a client, you ned the VTP domain to match.
>
> For DTP to work on a trunk, one needs to be switchport dynamic auto
> and the other end desirable. Trunk encapsulation will auto-negotiate
> as well if left to the default.
>
> DTP has nothing to do with VTP.
>
> On 4/22/06, James Ventre <messageboard@ventrefamily.com> wrote:
>
> Let me clarify a bit further:
>
> For DTP to form a trunk with the other end, your VTP domain needs to
> match on both ends. This would be an instance where you need to set
> the domain with a mode of transparent.
>
> James
>
> James Ventre wrote:
>
> For DTP to form a trunk it has to match on both ends of the link.
>
> Hash Aminu wrote:
>
> Hello GS,
>
> just to clear this issue if i am running in VTP Transparent mode , do
> i need
> to make sure that the VTP domain name is the same or configure it at
> all? i
> feel there is no need since i am not running VTP, but can anyone think of
> any situation where we need to configure the VTP domain name in
> Transparent
> mode .
> TIA
>
> Hash
>
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