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jacksch4820 asked on

Vlan tagging / trunk port question

Hi
Please see my network diagram attached.
My question is must I create vlan 10 20 and 30 on all 3 switches so my virtual machines in vlan 10 20 and 30 can communicate across the switches/trunk witch each other.
Please advice
Network-Diagram.jpg
Switches / Hubs

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Don Johnston

8/22/2022 - Mon
Member_2_6582184

Hello,

depending if you have something like GVRP running witch basically doeus the job for you - you will have to create each and every vlan on the switches which need need to 'see' the vlan.
If you just want to 'pipe' the vlan's through the middle switch it will do if you just tag the trunks (on every switch).
HTH!
ASKER
jacksch4820

Hi Helge000
i dont have GVRP running on my switches.
i just want to pipe the vlans through how can i tag the trunks
Member_2_6582184

This depends on your switches of course - but generally you have a management vlan, and your vlan's 10,20,30 (I just assume that). Also, I will call your mgmt vlan '1'.

In vlan config of your switch should see the trunks as 'one' virtual interface, even if you did bond a few physical ports together.  

On switch 1, look for your trunk.
Tagglist:
- vlan 1 untagged
- vlan 10,20,30 tagged

Based on your switches untagged vlan's might be called something like 'PVID' (primary vlan identification, esp. Netgear)

Do the same on all the interswitch trunks of the other switches and you should be good.
Your help has saved me hundreds of hours of internet surfing.
fblack61
Don Johnston

My question is must I create vlan 10 20 and 30 on all 3 switches so my virtual machines in vlan 10 20 and 30 can communicate across the switches/trunk witch each other.
The VLANs must exist on all switches that traffic from those VLANs transits. How those VLANs come to exist is a variable. But whether you manually create them, use VTP or GVRP, the VLANs must exist on all three of those switches.
Member_2_6582184

True! You still need to create the vlan on the switch with GVRP, but you do not need to tag the ports.  Sorry, this was unclear. Thanks donjonston!
ASKER
jacksch4820

Ok they all are Cisco switches.
So basically I got three options to that.
1.      Using GVRP
2.      Tagging needed vlans on all trunk ports.
3.      Create vlans on all switches.
Please advice if I’m correct
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