Aci node id for multi site deployment

[compterds]

Good afternoon,

we are running aci on a datacenter site, so we have 1 fabric at the moment. We’ll have probably a second fabric on a 2nd DC which will run his own apic cluster. 

In this case, we can use same node id for each node across both fabric because its 2 separate aci environment. 

Now let’s assume we decide going for a multi site deployment with multi site controller and so on. Migration is supported , but we’ll have to reset each node id on one of our DC if we had chosen the same as the first DC ? Right ? 

Thanks 

yoann 

[Manuel Velasco · Accepted solution]

Hi Compterds,

In multi-site  the node ids are specific to the site so they don't need to be different, this is where the SiteID is used.

[compterds]

Thanks for your help.
Yoann

[Leo Gal]

Do I understand it correctly, that when preparing APICs for Multisite, one pod has to have Fabric ID 1 and on another one I need to setup for Fabric ID 2?

Thanks

[Sergiu.Daniluk]

Hi,

The APIC fabric ID in a Multi-Site deployment can be unique, or the same value can be used across sites.

The only scenario where it is mandatory to deploy separate fabric IDs across sites is the deployment of shared GOLF (supported from Cisco ACI Release 3.1(1)), specifically when auto-RT is enabled and all the sites are part of the same BGP ASN. If those two conditions are not true, then it is perfectly fine to deploy the same fabric ID across all the sites even in a shared GOLF design.

The Cisco ACI Multi-Site site ID or site name must be unique across all sites. This parameter is configured directly on the Cisco ACI Multi-Site Orchestrator and cannot be changed after it has been assigned

Note: The Cisco ACI Multi-Site ID is different from the Cisco ACI fabric ID assigned on the APIC.

Regards,

Sergiu

[Leo Gal]

Thank you Sergiu!!!