VTP Transparent Mode

[ankitohc]

Hi Team,

I am trying to do configuration on VTP Transparent Mode however routers are not able to communicate with each other. 

Can anyone please help me to check the root cause?

https://drive.google.com/file/d/1GqrWiVm77RO0jnWT5xcCS8MDB3iyILhm/view?usp=sharing

Please note- interfaces are not the same as mentioned in the book...

[David Ruess]

Hello,

I didn't check the configs since I am unable to at the moment but 2 things:

1. Your book picture shows ICND1 labs. ICND 1 has been retired as an exam for some time now. IN addition I believe they have removed most if not all of VTP as an exam blueprint item on the CCNA and other exams. 

2. In VTP transparent mode you need to manually create the VLANS on both switches along with correct router subinterfaces and trunk links.

Can you post the config of both switches nd routers in here along with interface descriptions to say which interface points to which device.

-David

[Martin L]

Root cause is a simulator PT which does not support extended vlan range; that's what it looks to me anyway.   IF you run show interface trunk , you will see that your 2000k vlans are missing in Vlans allowed on trunk output.  Use vlan up to 1001 range.

Regards, ML
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[Joseph W. Doherty]

"IF you run show interface trunk , you will see that your 2000k vlans are missing in Vlans allowed on trunk output.  Use vlan up to 1001 range."

Indeed, in fact I changed the two switches VLAN 2010 to VLAN 201 and can ping between the routers.

Reading the lab, there's much going on, because as Martin notes, extended VLANs are being used, which requires (and supposedly should, itself, set) VTP mode to transparent if VTP v1/v2 is being used.  (NB: VTP v3 supports extended VLANs.)

(Also, VTP transparent mode will pass VTP packets along, but in this setup, neither VTP switch is a VTP server or client, i.e. there shouldn't be any VTP packets to pass alone.  I.e. VLAN information is NOT shared between the two switches.  The only point of VTP transparent mode, in this example, again, it's required for an extended VLAN to be used across a trunk.  [Which it also appears PT doesn't support.])

[ankitohc]

Hi Martin,

You are right, I have changed the VLAN number, and it worked; both the routers can communicate with each other. 

Can I create the extended VLAN in GNS or the actual Switch? I have followed the tasks which are written in the book. Do we need to create extended VLAN at some point, OR its not required?

[Martin L]

You need real switch to practice VTP version 3, extended and Private Vlans, VTP prunning. GNS3 need "special" IOU image.  You could try free online CML version via DevNet Sandbox; I think their switch image should support it. Check your exam topics for subject like VPT version 3 and transparent mode. The only topic I remember that requires extended vlans is Private vlan technology. If you see Private vlan objective on your exam, you will need extended vlans.  Those usually are CCNP-level but now they might be at CCNA level as well.  Otherwise, there is not much difference between the extended VLANs and regular vlans.

Regards, ML
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