Catalyst Center Disaster 1+1+1

[aleopoldie]

Hello,

I have a question regarding the Catalyst Center Disaster 1+1+1 design (1 Catalyst Center in the main site, 1 Catalyst Center in the recovery site and 1 Witness VM). We can have L2 between the 2 x Datacenters.

I understand for a 3+3+1 design, we have 2 clusters, one on the main site and one on the secondary site.

But what about the 1+1+1 ? Do we have to configure a dedicated cluster of 1 appliance on the main site and another one in the recovery site ? Meaning 1 enterprise VIP for the main site and a different one for the recovery site ?

It means there would be only one Catalyst Center on the cluster of the main site and one Catalyst Center on the cluster of the recovery site. If I understand correctly ?

I checked the official documentation but that's not very clear... 

https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/catalyst-center/2-3-7/admin_guide/b_cisco_catalyst_center_admin_guide_237/b_cisco_dna_center_admin_guide_2_3_7_chapter_0111.html

Thank you,

A.

[balaji.bandi]

1+1+1 = disaster recovery - that not replace 3 Node cluster.

Main site 1 is active other one will be standby and waiting for Master to Fail, so standby DR will become active, based on witness decision.

there is also tunning between DR site to check and replicate the information. (some of the features not completly replicate, Like Assurance data, when DR site failover).

You can have different cluster each site if you looking active and active and you can manage Centrally.

Its all depends on the cost and deployment, if you able to meet 1+1+1 (that is the lowest cost model for DNAC deployment) other than standalone one.

3+3+1 = is expensive (this is suggested larger deployments.

[Preston Chilcote · Accepted solution]

@aleopoldie  This is the relevant excerpt from the doc you provided

1+1+1 setup: One Catalyst Center appliance functions as your Main Site, a second appliance serves as your Recovery Site, and a third system (residing on a virtual machine) acts as your Witness Site. [end excerpt]

We don't conventionally call a single appliance, "a cluster".  It's just an appliance at that point.  

You are correct that each appliance at each DC will have it's own unique enterprise IP address configured.

[aleopoldie]

Thank you Preston