Administrator Guide

Cluster Scaling Limitations
Due to the design requirements of the cluster Publisher/Subscriber model, various W-ClearPass components
scale differently (see Table 22).
Table 22: W-ClearPass Cluster Scaling Limitations
Component Scaling Limitation
Authentication capacity
Scales linearly according to the number of Subscriber nodes.
Add more nodes as necessary to provide additional capacity to service
authentication requests.
Configuration changes
(Guest/ Onboard)
These configuration changes do not scale with additional nodes as they are
centralized.
Requires the Publisher be scaled to support write traffic from the maximum number
of Subscribers that would be active concurrently.
Configuration changes
(Policy Manager)
As the total size of the configuration set is bounded, these configuration changes are
assumed to be infrequent and therefore not a significant limit to scaling.
Insight reports
Because this function is centralized, reporting does not scale with additional nodes.
Use a separate Insight node sufficient to handle the incoming Netevents traffic from
all nodes in the cluster. In a very large-scale deployment, the Publisher node should
not be used as the Insight reporting node.
Logging capacity
Scales linearly according to the number of Subscriber nodes, as each node handles
its own logging operations.
Replication load on
publisher
Scales linearly according to the number of Subscriber nodes. The replication is
efficient as only changed information is sent.
Cluster Design Considerations
This section contains the following information:
l Cluster Deployment Sizing Guidance
l Publisher Node Guidelines
l Subscriber Node Guidelines
l Providing Sufficient Bandwidth Between Publisher and Subscribers
l RTT Considerations When Building Geographically Distributed Clusters
l Implementing W-ClearPass Zones for Geographical Regions
This section contains recommendations on how to optimize the Publisher and Subscriber constraints when
deploying a W-ClearPass cluster.
Cluster Deployment Sizing Guidance
The maximum single cluster size is limited to 30 nodes.
Dell Networking W-ClearPass Deployment Guide Deploying W-ClearPass Clusters | 135