Cisco Cisco Expressway
Single Clustered Network Elements
In this scenario each network element is clustered.
Multiple Clustered Network Elements
In this scenario there are multiple clusters of each network element.
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Jabber clients can access their own cluster via any route
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Expressway-C uses round robin to select a node (publisher or subscriber) when routing home cluster discovery
requests
requests
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Each combination of Unified CM and IM and Presence Service clusters must use the same domain
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Intercluster Lookup Service (ILS) must be active on the Unified CM clusters
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Intercluster peer links must be configured between the IM and Presence Service clusters, and the Intercluster
Sync Agent (ICSA) must be active
Sync Agent (ICSA) must be active
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Mobile and Remote Access Through Cisco Expressway Deployment Guide
Deployment Scenarios