This carries the human-readable name of the interface whose CAC bandwidth threshold triggered the notification, letting the admin immediately identify the physical or logical port involved rather than decoding a bare CAC index. Because CAC thresholds usually indicate an interface approaching its configured admissible-bandwidth limit for new LSPs, this name is the actionable detail for capacity planning. For example, an interface name of te-1/1/3 in the trap tells the admin exactly which port needs a bandwidth increase or traffic rebalancing.