The Cisco 12000 Series 4-Port Gigabit Ethernet ISE Line Card delivers a comprehensive range of features at line rate that enable the Cisco 12000 Series to accommodate many Layer 2 and Layer 3 Ethernet edge applications such as metro Ethernet aggregation, peering, and Cisco IPv6 services without compromising performance. The line card provides granular quality of service (QoS) with dedicated queues per virtual LAN (VLAN). Each card supports 4 physical ports and 1020 VLANs, and 4 classes of service can be provided in each VLAN or port.