About Domain, Host, and Port Labels
Labels help simplify configuration by allowing you to group multiple items under a single name. Instead of configuring features individually for each item, you can apply one label to cover all of them. For example, if you want to create an in-path rule for all Office365 traffic, you can define a label called Office365 that includes all relevant application domains. Then, instead of writing separate rules for each domain, you apply the label to one rule.Label names are not case-sensitive, but rule-matching is. Names can be up to 64 alphanumeric characters and may include underscores (_) and hyphens (-), but not other special characters or spaces. You can also assign the same item to multiple labels. However, IPv6 is not supported, and labels in use cannot be deleted.
Labels work with autodiscover, passthrough, and fixed-target in-path rules, but not with packet mode rules.