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Beginner

VTP Transparent Mode - Nexus 9000

Hi,

 

Would like to understand the specific reason for supporting only VTP TRANSPARENT mode in Cisco Nexus 9000 series switches.

 

Pls help

Rgds

6 REPLIES 6
Cisco Employee

Hello,The Nexus 9000 only

Hello,

The Nexus 9000 only supports VTP in transparent mode by design. The switch is meant for a Datacenter environment, and VTP is considered to be a Enterprise/Campus switching feature so it was not included in the Initial Development cycle other than to transparently forward VTP for existing infrastructure. It is currently not on the road-map as well to be supported in a later release.

Hope this answers,

Vinit

PS: Please mark the question as complete if your queries have been answered.

Thanks
--Vinit
Beginner

Re: Hello,The Nexus 9000 only

So ... what feature does Cisco provide as replacement to synchronize VLANs in a cluster containing Nexus9Ks ?
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Rising star

Just to add to Vinit's post

Just to add to Vinit's post most of the Cisco documentation now recommends that you configure VTP transparent mode on switches enterprise wide, regardless of whether they are deployed in the DC or Campus edge.

This helps to decrease the potential for misconfiguration errors that can occur with Client / Server mode. Worse case in a DC with potentially hundreds of VMs this could could cause a major outage for thousands of users.

Beginner

Re: Just to add to Vinit's post

But since nexus9K only support transparent mode, configure or not, it wont cause any outage that caused by inconsistent VTP revision number.

Configured with VTP transparent mode: no impact on revision number

Not enabling VTP feature: Also no impact to revision number 

 

So, if the VM hosts are connected to nexus 9K, by right we dont have the VTP potential risk

VIP Advisor

Re: Just to add to Vinit's post

Hello


@sean_evershed wrote:

Just to add to Vinit's post most of the Cisco documentation now recommends that you configure VTP transparent mode on switches enterprise wide, regardless of whether they are deployed in the DC or Campus edge.

This helps to decrease the potential for misconfiguration errors that can occur with Client / Server mode. Worse case in a DC with potentially hundreds of VMs this could could cause a major outage for thousands of users.


VTP ver 3 negates any overwriting of the D/B so if any misconfiguration does occur be it client/server - So i would say having a vtp estate in transparent mode would be admin intensive and not very practical

 

 

 



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
Contributor

Re: VTP Transparent Mode - Nexus 9000

 

VTP allows each router or LAN device to transmit advertisements in frames on its trunk ports. These frames are sent to a multicast address where they can be received by all neighboring devices. They are not forwarded by normal bridging procedures. An advertisement lists the sending device's VTP management domain, its configuration revision number, the VLANs which it knows about, and certain parameters for each known VLAN. By hearing these advertisements, all devices in the same management domain learn about any new VLANs that are configured in the transmitting device. This process allows you to create and configure a new VLAN only on one device in the management domain, and then that information is automatically learned by all the other devices in the same management domain.

Once a device learns about a VLAN, the device receives all frames on that VLAN from any trunk port by default, and if appropriate, forwards them to each of its other trunk ports, if any. This process prevents unnecessary VLAN traffic from being sent to a device.

VTP also publishes information about the domain and the mode in a shared local database that can be read by other processes such as Cisco Discovery Protocol (CDP)
VTP is supported in these modes:

Transparent—Allows you to relay all VTP protocol packets that it receives on a trunk port to all other trunk ports. When you create or modify a VLAN that is in VTP transparent mode, those VLAN changes affect only the local device. A VTP transparent network device does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements.
If VTP is in transparent mode, you can configure VLAN long names of up to 128 characters.
VTP allows you to enable or disable the VTP protocol on a per-port basis to control the VTP traffic. When a trunk is connected to a switch or end device, it drops incoming VTP packets and prevents VTP advertisements on this particular trunk. By default, VTP is enabled on all the switch ports.
VTP has the following configuration guidelines and limitations:

show commands with the internal keyword are not supported.
In SNMP, the vlanTrunkPortVtpEnabled object indicates whether the VTP feature is enabled or not. The status of the vlanTrunkPortVtpEnabled object aligns with the output of the show vtp trunk interface eth a/b command

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