When neither the active or standby Location Bandwidth Manager in the configured LBM group is available, what will the Cisco CallManager service on a subscriber Cisco Unified Communications Manager server do to make location CAC decisions?
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A. B. C. D. E.D.
By default the Cisco CallManager service communicates with the local LBM service; however, LBM groups can be used to manage this communication.
LBM groups provide an active and standby LBM in order to create redundancy for Unified CM call control.
In a Cisco Unified Communications Manager (CUCM) cluster, the Location Bandwidth Manager (LBM) provides a mechanism for implementing Call Admission Control (CAC) at the location level. LBM groups consist of a primary LBM and one or more backup LBMs. The active LBM in the group makes the CAC decisions for the location.
If neither the active nor the standby LBM in the configured LBM group is available, the Cisco CallManager service on a subscriber CUCM server cannot obtain the necessary CAC information for location-based calls. In this situation, the behavior of the CallManager service depends on the Call Treatment When No LBM Available service parameter.
The Call Treatment When No LBM Available parameter has two options: "Allow Calls" and "Reject Calls." These options specify how the CUCM handles calls when no LBM is available. The default action is to allow calls.
Therefore, if the Call Treatment When No LBM Available parameter is set to "Allow Calls," the CUCM allows all calls to be established, regardless of the available bandwidth at the location. This can result in degraded call quality or network congestion. If the parameter is set to "Reject Calls," the CUCM rejects all calls to the location until an LBM becomes available.
Option A, "It will attempt to communicate with the first configured member in the Location Bandwidth Manager hub group," is incorrect. The CUCM does not attempt to communicate with the first member of the LBM group because both the active and standby LBMs are unavailable.
Option D, "It will attempt to communicate with the local LBM service for location CAC decisions," is also incorrect. The local LBM service on the subscriber server cannot make CAC decisions for locations that are not associated with it.
Option E, "It will allow all calls until communication is reestablished with any configured servers in the LBM group," is similar to the behavior when the Call Treatment When No LBM Available parameter is set to "Allow Calls." Therefore, option E is not the correct answer.
In summary, the correct answer to the question is B: "It will use the Call Treatment When No LBM Available service parameter with the default action to allow calls."