Make two seperate networks with HPE 1920s 8G switches

[Thomas Hobson]

Hello to all,

I would need to make two seperate networks run on a single infrastructure.
Is this possible with HPE 1920s 8G switches ?
Because I have 3 of them.
I see they are capable of VLAN and TRUNK.
If I understand correctly, I need to connect the 3 switches between then via TRUNK so that the VLAN I create will exist over the entire network.

Is this correct ?
Is this doable with this equipement ?

Thanks for the advice.

Andrew

[Emil_G · Accepted solution]

Hello @Thomas Hobson 

Yes, if you need to run 2 separate networks on a single  infrastructure, you need to configure 2 VLANs on the switches. A VLAN is a broadcast domain and basically corresponds to an IP subnet.

The specific thing with this switch and some other HPE models is that the term TRUNK  has the meaning LINK AGGREGATION and not a port which carries mutliple VLANs. So you have a trunk when you assign 2 or more physical ports to a logical link-aggregation interface such that the physical ports can provide redundancy, resiliency and load-balancing.

The HPE Comware switches, the ArubaOS-CX switches and some other vendors use the term trunk in the meaning, interface which carries multiple VLANs, one of them being native VLAN or PVID.

On the 1920S if you want to transport multiple VLANs over the same port or link-aggregation you make the port a member of this VLANs by specifying the participation as "include". Then you have to configure the "tagging". A port can participate in a single VLAN as "untagged" and in mutliple VLANs as "tagged". The untagged and tagged VLANs have to match between the interconnected switches. This is especially true for the untagged VLANs.

If we compare this with the term VLAN trunk of HPE Comware and ArubaOS-CX, the untagged VLAN is the native VLAN or PVID. The tagged VLANs are the allowed VLANs.

With just 2 networks that you need to create you need first the create a second VLAN (there is VLAN 1 created by default with all ports belonging to it ) then configure the ports interconnecting the switches as "include" and "untagged" in the first VLAN and "include"  and "tagged" in the second VLAN. 

The ports which connect end devices should be configured as "include" untagged in the respective VLAN.

Please have a look at Chapter 5 Virtual LAN page 89

https://support.hpe.com/hpesc/public/docDisplay?docId=a00003478en_us

[Thomas Hobson]

Hello Emil,

Thanks for this complete reply.

So I will try to do it. And I will let you know if I was able to make it work,

Andrew

[Emil_G]

Hello Andrew, 

Did you have time to configure the VLANs on the 1920S switches, Please share a short update or mark the topic as resolved if you could make it work.

[Thomas Hobson]

Hi Emil,

No I still didn't try it.

I will try it this week-end when I will be alone. And I'll get back to you.

Please don't close this support ticket yet.

Andrew

[Thomas Hobson]

Hello Emil,

I wanted to say : Thank You !

I finally took the time to configure my HPE 1920S switches as you explained and it works. VLAN's between several HPE 1920S switches work great. I was able to confugure my network to isolate in a VLAN what I needed.

Cool.