Shadow locations in Cisco UCM enable SIP intercluster trunks to pass enhanced location-based call admission control (CAC) information between Unified CM clusters. Learn how shadow locations work and their benefits for managing voice traffic across multiple CUCM clusters.
Table of Contents
Question
What is a statement about shadow locations in Cisco UCM?
A. Shadow location enables a SIP intercluster trunk to pass enhanced location-based CAC information between Unified CM clusters.
B. Shadow location enforces low-bandwidth codec for calls between Unified CM clusters.
C. Shadow location enables a non-SIP intercluster trunk to pass enhanced location-based CAC information between Unified CM clusters.
D. Only the intercluster trunk can be assigned to shadow location.
Answer
A. Shadow location enables a SIP intercluster trunk to pass enhanced location-based CAC information between Unified CM clusters.
Explanation
A shadow location in Cisco Unified Communications Manager (CUCM) is a location that enables a SIP intercluster trunk (ICT) to pass enhanced location-based call admission control (CAC) information between Unified CM clusters.
When you configure a SIP ICT between two CUCM clusters, you assign the SIP ICT to a shadow location in each cluster. The shadow location corresponds to the remote cluster the SIP ICT connects to. For example, if Cluster 1 has a SIP ICT to Cluster 2, you would create a shadow location in Cluster 1 that represents the location of Cluster 2. Likewise, you would create a shadow location in Cluster 2 that represents the location of Cluster 1.
The purpose of the shadow location is to associate a SIP ICT with the location and link bandwidth limits of the remote cluster it connects to. This allows the originating cluster to accurately account for the WAN bandwidth usage and enforce call admission control for calls routed over the SIP ICT to the other cluster.
When a call is placed over the SIP ICT, the originating cluster checks the location bandwidth limits associated with the shadow location of the destination cluster. If there is sufficient bandwidth available, the call is allowed. If not, the call is rejected to prevent oversubscription of the WAN link.
So in summary, shadow locations work with enhanced location CAC to enable multiple CUCM clusters to effectively manage and limit voice traffic over the WAN links interconnecting them. The key points are:
- Shadow locations are used on SIP intercluster trunks between CUCM clusters
- The shadow location represents the location and bandwidth limits of the remote cluster the SIP ICT connects to
- This allows the originating cluster to track bandwidth usage and enforce call admission control for calls to the other cluster
- Shadow locations work with enhanced location CAC, an improvement over traditional location CAC
- Shadow locations are only applicable for SIP intercluster trunks, not other trunk types
Cisco 350-801 certification exam assessment practice question and answer (Q&A) dump including multiple choice questions (MCQ) and objective type questions, with detail explanation and reference available free, helpful to pass the Cisco 350-801 exam and earn Cisco 350-801 certification.