01-15-2023 02:55 PM
Hi,
I would like to connect our VMware infrastructure to ACI. We have 10 DVS so we will configure 10 VMM domains for them.
My concern is: as each EPG should be "propagated" down to all 10 DVS, if I understand correctly, ACI will assign 10 different VLAN for each EPG and sooner or later, we will run out of VLAN in the VLAN pool.
I have 2 questions:
Thanks.
Solved! Go to Solution.
01-25-2023 11:20 AM
Hi @suneq ,
From what I understand, they have 3 vCenters which manages 10 clusters; each cluster uses a seperate vDS and VLANs are propagated to all these 10 vDS.
Due to different reasons, they want to keep this architecture instead of reducing the number of vDS.
OK. You can build 10 VMMs in ACI and then add each of the 10 VMMs to each EPG to achieve what you want to do.
Normally, this would mean 10 VLAN Pools, each with its own range of VLANs. However if you are concerned about running out of VLANs, I'd suggest the following: [Note: I have not tested the following and can't give you a 100% guarantee it will work]
To be honest, I'd feel better advising:
01-15-2023 04:20 PM - edited 01-15-2023 05:12 PM
Hi @suneq ,
[Edit: Check another answer I just wrote too]
I would like to connect our VMware infrastructure to ACI. We have 10 DVS so we will configure 10 VMM domains for them.
That's about correct. But 10 vSwitches is quite a lot of vSwitches. But it's the next bit that worries me more
My concern is: as each EPG should be "propagated" down to all 10 DVS,
This is the bit that really confuses me - WHY would you have the SAME EPG on multiple vSwitches. To me, this just doesn't make sense.
if I understand correctly, ACI will assign 10 different VLAN for each EPG and sooner or later, we will run out of VLAN in the VLAN pool.
ACI really only needs one VLAN per EPG normally - but if you blindly go ahead and configure the same EPG on multiple VMM Domains, ACI will choose a VLAN from a VLAN Pool for that EPG - but you can control this using static mappings.
I have 2 questions:
- Was my understanding correct (ACI will assign 10 VLAN for each EPG in our scenario)?
- If yes, do we have any solution to optimize the VLAN usage? Any kind of synchronization between VMM domains so that we can assign only 1 VLAN for each EPG for example
The answer to both these Qs is "Not if you use static mappings."
If you want, you can map each EPG to the same VLAN that is using now - but you will have to create a Dynamic VLAN Pool, then add a static range of VLANs to this pool.
Remember every vSwitch needs an Uplink, so if you want two different vSwitches on the same ESI host, it will need two uplinks. But this brings me back to my earlier comment. So this give me two questions:
01-16-2023 12:07 AM
I think first it's important to understand how your current vmware env is configured:
- how many vcenters you have?
- how many DVS per vcenter?
- how many DVS per host you have?
- how many datacenters you have in each vcenter?
If you could share a drawing with the design then we could make a better suggestion on how ACI VMM domain(s) should be configured.
Take care,
Sergiu
01-25-2023 02:39 AM
Hi,
My apologies for the late reply.
Thanks so much for your advices. I will have a meeting with the VM team soon and will ask them for more details.
From what I understand, they have 3 vCenters which manages 10 clusters; each cluster uses a seperate vDS and VLANs are
propagated to all these 10 vDS.
Due to different reasons, they want to keep this architecture instead of reducing the number of vDS.
01-25-2023 11:20 AM
Hi @suneq ,
From what I understand, they have 3 vCenters which manages 10 clusters; each cluster uses a seperate vDS and VLANs are propagated to all these 10 vDS.
Due to different reasons, they want to keep this architecture instead of reducing the number of vDS.
OK. You can build 10 VMMs in ACI and then add each of the 10 VMMs to each EPG to achieve what you want to do.
Normally, this would mean 10 VLAN Pools, each with its own range of VLANs. However if you are concerned about running out of VLANs, I'd suggest the following: [Note: I have not tested the following and can't give you a 100% guarantee it will work]
To be honest, I'd feel better advising:
01-29-2023 04:04 PM
Hi @RedNectar
Thanks a lot for your answer, very clear as always.
I will try to test the solution you suggested with our lab and provide the feedback.
Thanks again for all your help.
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