Dell Command Line Reference Guide for the S4048–ON System 9.14.2.8

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track ip route metric threshold

Configure object tracking on the threshold of an IPv4 route metric.

Syntax
track object-id ip route ip-address/prefix-len metric threshold [vrf vrf-name]

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 1 to 500.
ip-address/ prefix-len
Enter an IPv4 address in dotted decimal format. The valid IPv4 prefix lengths are from /0 to /32.
vrf vrf-name
(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 EMC Networking OS Command Line Reference Guide.

Version
Description
9.10(0.1)
Introduced on the S6010-ON and S4048T-ON.
9.10(0.0)
Introduced on the S3148.
9.10(0.0)
Introduced on the S6100-ON.
9.8(2.0)
Introduced on the S3100 series.
9.8(1.0)
Introduced on the Z9100-ON.
9.8(0.0P5)
Introduced on the S4048-ON.
9.8(0.0P2)
Introduced on the S3048-ON.
9.7(0.0)
Introduced on the S6000-ON.
8.3.12.0
Introduced on the S4810.
8.4.1.0
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 – 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.

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