Different ISE SNS Appliance can be used in Standalone HA Deployment?

[kyawzinlatt]

For ISE Standalone HA deployment, primary and secondary node can be different appliance model? License need to be installed on the secondary node?

[UdupiKrishna · Accepted solution]

You can deploy ISE cluster/HA with different hardware models, but the general recommendation from Cisco would be to use the same model.

This way, there wouldn't be any performance issues after a possible failover since they would be sized the same way. Do keep in mind that each hardware has different performance numbers.

While the license is not mandatory for the secondary admin node, but if you are to promote it in the future, then its required.

During PAK registration, there's a field to fill in the secondary UDI, S/N which will cover both nodes.

[kyawzinlatt]

PAK registration was already done by other Secondar Node UID/SN. Now I want to replace that node by other appliance. So do I need to transfer the license again if I need to promote the secondary one?

[UdupiKrishna · Accepted solution]

Yes, the licenses needs to re-hosted with the serial/UDI of the new appliance. Easy way is to work with Cisco licensing team to get this sorted out.

[ammahend · Accepted solution]

They can be different appliance, they can also be a combination of appliance or VM, for single deployment (with multiple nodes) you need only 1 set of license except VM license which is needed for each VM and Device administration license which is needed to each node configured for device administration services

just be aware that when primary fails, the secondary should be able to take on all the load, that's why similar device is recommended for secondary.

[thomas · Accepted solution]

They can be mixed appliance, VM or cloud however they *should* be the same size for scaling.

Otherwise you must use the smaller of the two for scaling - you cannot expect to switch over to a smaller secondary and expect it to handle the same maximum deployment scale of endpoints.

See https://cs.co/ise-scale for deployment scaling.