Tag-Based vs. Service Mapping

[munwong]

Is there a table that list out the Pros & Cons and Benefits of using Tag-Based mapping vs. Top Down Service Mapping? I know Tag-Based Service Mapping is used to map Cloud applications but we could technically map on-prem applications as well if we setup tags for all the components. Has anyone used Tag-Based mapping for on-prem hosted applications? Can anyone help what Tag-Based Mapping can do and cannot do vs. Service Mapping?

[Mike_R]

The link has some good info 

https://docs.servicenow.com/bundle/tokyo-it-operations-management/page/product/service-mapping/conce...

Mapping method Description Advantages Disadvantages

Discovery based on Predictive Intelligence	Predictive Intelligence evaluates connections between application fingerprints, CIs and processes, and ranks their relevancy. Service Mapping uses this information to create connections based on connection rules. It also generates connection suggestions for servers and load balancers for you to decide which connections to add or remove from the application services.	Service Mapping automatically adds CI connections and CIs they lead to based on connection rules. You can modify the default connection rules or create your own to enhance this discovery method. Discovery based on Predictive Intelligence is effective for mapping multiple application services.	When using discovery based on Predictive Intelligence to identify TCP connections and processes, deploy it in large on-premise deployments. Predictive Intelligence is a machine learning solution and needs training. To achieve best results using this discovery method, you must run discovery repeatedly. Service Mapping may erroneously add or remove dynamic connections.
Pattern-based discovery	Service Mapping uses patterns to discover and map CIs. A pattern is a sequence of commands whose purpose it is to detect attributes of a CI and its outbound connections. A typical Service Mapping pattern consists of separate algorithms for identifying CIs and finding CI connections.	Pattern-based discovery creates precise and complete application services that reliably represent the service-aware view of your organization's IT infrastructure.	Pattern-based mapping requires configuring credentials, users, and user permissions to let Service Mapping access applications inside your organization private network. This process may take time and effort.
Tag-based discovery	If your organization uses tags for asset management, you can use these tags to map application services. Discovery and Cloud Provisioning and Governance discover tags assigned to CIs, and populate the CMDB with this data. Service Mapping uses the tag-related data from the CMDB to map services.	You can effectively use tags to map multiple application services.	Tag-based application services may not include relevant CIs, if these CIs do not have the correct tags assigned to them.
Traffic-based discovery	Service Mapping can discover and map configuration items (CIs) following their traffic-based connections. This method is referred to as traffic-based mapping and it complements the pattern-based mapping. Depending on your configuration, the behavior of traffic-based discovery varies.	Using traffic-based discovery is like casting a finer net, allowing Service Mapping to find even those CIs that it failed to discover using patterns.	While using traffic-based discovery creates a more inclusive map, it may also result in mapping many redundant CIs that do not influence the application service operation. It may clutter an application service with irrelevant CIs. Use traffic-based discovery at the initial stages of discovering an application service and disable it once you completed discovery and fine-tuned the application service.