Cisco 6504-E User Guide - Page 227

Chapter 5 Physical Object Dialog Boxes C6576M ATM SONET Interface Dialog Box IS-IS Area The IS-IS area contains the following information: • ISIS Enabled-Indicates whether or not IS-IS routing is enabled on the interface. This attribute is read-only. • Area Tag-Identifies the IS-IS routing area that the interface participates in. If multiyear IS-IS is configured on the device, the IS-IS area must be named; otherwise, this value may be an implicit null tag. This attribute is read-only. • Level 1 Hello Interval-Length of time between hello packets generated on the interface for level 1 routing. With smaller hello intervals, topological changes are detected faster, but there is more routing traffic. • Level 1 Metric-Cost of the interface for IS-IS level 1 (intra-area) route calculation. • Level 1 Priority-Level 1 priority. The priority is used to determine which router on a LAN will be the designated router or designated intermediate system (DIS). The router with the highest priority will become the DIS. In the case of equal priorities, the highest MAC address breaks the tie. • Level 2 Hello Interval-Length of time between hello packets generated on the interface for level 2 routing. • Level 2 Metric-Cost of the interface for IS-IS level 2 (interarea) route calculation. • Level 2 Priority-Level 2 priority. • Enable button-Enables IS-IS routing on the interface. Note To enable IS-IS on an interface, the user must specify an IS-IS routing process that is already deployed on the device. If the process does not exist, the action will fail. • Disable button-Disables IS-IS routing on the interface. Note By default, all interfaces are configured as IS-IS Circuit-type Level 1-2. Cisco 6500/7600 Series Manager User Guide 5-113