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According to the [Service Level Expectations] page, Service Level Expectations (SLEs) are a set of metrics that measure the quality and performance of the wireless network from the user's perspective. SLEs can help network administrators monitor, troubleshoot, and optimize their network by providing real-time and historical data and analytics. SLEs can also help network administrators identify and resolve issues before they impact the user experience.
There are seven SLEs that are supported by Mist: Successful Connects, Time to Connect, Capacity, Coverage, Throughput, Roaming, and WAN. Each SLE has a target value and a threshold value that can be customized according to the network requirements. The SLE score is calculated as the percentage of clients that meet or exceed the target value for each SLE.
Two SLEs that report DHCP problems are Successful Connects and Time to Connect. DHCP (Dynamic Host Configuration Protocol) is a protocol that assigns IP addresses and other network configuration parameters to devices on a network. DHCP problems can occur when a device fails to obtain an IP address from the DHCP server or when the DHCP server is slow or unreachable.
Successful Connects is an SLE that measures the percentage of clients that successfully connect to the wireless network within a specified time frame. Successful Connects can report DHCP problems by showing the number of clients that fail to connect due to DHCP errors, such as DHCP timeout, DHCP NAK, or DHCP decline. Successful Connects can also show the root cause analysis and recommended actions for resolving DHCP problems.
Time to Connect is an SLE that measures the average time it takes for a client to connect to the wireless network from the moment it sends a probe request to the moment it receives an IP address from the DHCP server. Time to Connect can report DHCP problems by showing the breakdown of the connection time into different stages, such as probe, auth, assoc, EAPOL, and DHCP. Time to Connect can also show the outliers and trends for each stage and identify if there are any delays or failures in the DHCP process.