Dell C1048P Port Extender Networking Command-Line Reference Guide for the C900 - Page 1225

Version 9.9(0.0) 9.8(0.0) 9.7(0.0) 8.3.12.0 8.4.1.0 Description Introduced on the C9010. Introduced on the S3048-ON and S4048-ON. Introduced on the S6000-ON. Introduced on the S4810. Introduced. Usage Information Use this command to create an object that tracks the UP and/or DOWN threshold of an IPv4 route metric. In order for a route's metric 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 the threshold of an IPv4 route metric as a tracked object, the UP/DOWN state of the tracked route is also determined by the current metric for the route in the routing table. 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. Related Commands • show track - displays information about tracked objects, including configuration, current state, and clients which track the object. • threshold metric - configures the metric threshold used to determine the UP and/or DOWN state of a tracked route. • track resolution ip route - configures 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. C9000 Series Syntax track object-id ip route ip-address/prefix-len reachability To return to the default setting, use the no track object-id command. Parameters object-id Enter the ID number of the tracked object. The range is from 1 to 500. Object Tracking 1225