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CCNP Security SISAS 300-208 Official Cert Guide by Kevin Redmon, Aaron Woland

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Communication Between Nodes

As mentioned previously, it is best to always deploy ISE in a redundant fashion when used in a production environment. This ensures that a single failure of ISE will not cause a permanent network outage. As you deploy the two-node, four-node, and fully distributed models as described previously, you must ensure that you allow the required communication and allocate the appropriate bandwidth between the individual nodes. If you fail to ensure proper communication between the nodes, the function and performance of the Cisco ISE ecosystem can be greatly impacted.

For all nodes, regardless of persona, it is imperative that you permit TCP/22 (SSH), TCP/80 (HTTP), and TCP/443 (HTTPS). These ports are used for administrative ...

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