Dell S3100 Command Line Reference Guide for the Series 9.100.0 - Page 894

Related Commands To provide a common tracking interface for different clients, route metrics are scaled in the range 0 to 255, where 0 is connected and 255 is inaccessible. The scaled metric value communicated to a client always considers a lower value to have priority over a higher value. The resulting scaled value is compared against the configured threshold values to determine the state of a tracked route as follows: • If the scaled metric for a route entry is less than or equal to the UP threshold, the state of a route is UP. • If the scaled metric for a route is greater than or equal to the DOWN threshold or the route is not entered in the routing table, the state of a route is DOWN. You configure the UP and DOWN thresholds for each tracked route by using the threshold metric command. The default UP threshold is 254; the default DOWN threshold is 255. The notification of a change in the state of a tracked object is sent when a metric value crosses a configured threshold. • show track - display information about tracked objects, including configuration, current state, and clients which track the object. • threshold metric - configure the metric threshold used to determine the UP and/or DOWN state of a tracked route. • track resolution ip route - configure the protocol-specific resolution value used to scale an IPv4 route metric. track ip route reachability Configure object tracking on the reachability of an IPv4 route. Syntax track object-id ip route ip-address/prefix-len reachability [vrf vrf-name] To return to the default setting, use the no track object-id command. Parameters object-id ip-address/ prefix-len vrf vrf-name Enter the ID number of the tracked object. The range is 1 to 500. Enter an IPv4 address in dotted decimal format. The valid IPv4 prefix lengths are from /0 to /32. (Optional) E-Series only: You can configure a VPN routing and forwarding (VRF) instance to specify the virtual routing table to which the tracked route belongs. Defaults None Command Modes CONFIGURATION Command History This guide is platform-specific. For command information about other platforms, see the relevant Dell Networking OS Command Line Reference Guide. Version Description 9.8(2.0) 9.8(1.0) 9.8(0.0P5) 9.8(0.0P2) 9.7(0.0) 8.3.12.0 8.4.1.0 Introduced on the S3100 series. Introduced on the Z9100-ON. Introduced on the S4048-ON. Introduced on the S3048-ON. Introduced on the S6000-ON. Introduced on the S4810. Introduced. Usage Information Use this command to create an object that tracks the reachability of an IPv4 route. In order for a route's reachability to be tracked, the route must appear as an entry in the routing table. A tracked IPv4 route is considered to match an entry in the routing table only if the exact IPv4 address and prefix length match a table entry. For example, when configured as a tracked route, 10.0.0.0/24 does not match the routing table entry 10.0.0.0/8. If no route-table entry has the exact IPv4 address and prefix length, the status of the tracked route is considered to be DOWN. When you configure IPv4 route reachability as a tracked object, the UP/DOWN state of the tracked route is also determined by the entry of the next-hop address in the ARP cache. A tracked route is considered to be reachable if there is an ARP cache entry for the route's next-hop address. 894 Object Tracking