Refer to the exhibit. ILS has been configured between two hubs this configuration. The hubs appear to register successfully, but ILS is not functioning as expected. Which configuration step is…

The correct answer is B. The Cluster IDs have not been set to unique values. ILS (Intercluster Lookup Service) uses the Cluster ID to uniquely identify each UCM cluster when replicating learned directory objects (URIs, phone numbers) between hubs. If both clusters retain the default Cluster ID or are set to the same value, ILS cannot distinguish one…

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Question

Refer to the exhibit. ILS has been configured between two hubs this configuration. The hubs appear to register successfully, but ILS is not functioning as expected. Which configuration step is missing?

Options

AUse TLS Certificates must be selected.
BThe Cluster IDs have not been set to unique values.
CA password has never been set for ILS.
DTrust certificates for ILS have not been installed on the clusters.

How the community answered

(15 responses)

A
7% (1)
B
80% (12)
C
13% (2)

Explanation

ILS (Intercluster Lookup Service) uses the Cluster ID to uniquely identify each UCM cluster when replicating learned directory objects (URIs, phone numbers) between hubs. If both clusters retain the default Cluster ID or are set to the same value, ILS cannot distinguish one cluster from the other, causing replication to fail silently even though the ILS hub registration appears successful. Setting a unique Cluster ID on each cluster (under System > Enterprise Parameters in UCM) is a prerequisite for ILS to function correctly. TLS certificates and passwords are optional depending on the security mode chosen.

Topics

#ILS Configuration#CUCM Intercluster#Troubleshooting#Cluster ID

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