Concept Guide

The UP and DOWN thresholds are user-congurable for each tracked route. The default UP threshold is 254; the default DOWN
threshold is 255. The notication of a change in the state of a tracked object is sent when a metric value crosses a congured
threshold.
The tracking process uses a protocol-specic resolution value to convert the actual metric in the routing table to a scaled metric in the
range from 0 to 255. The resolution value is user-congurable and calculates the scaled metric by dividing a route’s cost by the
resolution value set for the route type:
• For ISIS, you can set the resolution in the range from 1 to 1000, where the default is 10.
• For OSPF, you can set the resolution in the range from 1 to 1592, where the default is 1.
• The resolution value used to map static routes is not congurable. By default, Dell Networking OS assigns a metric of 0 to static
routes.
• The resolution value used to map RIP routes is not congurable. The RIP hop-count is automatically multiplied by 16 to scale it. For
example, a RIP metric of 16 (unreachable) scales to 256, which considers a route to be DOWN.
Displaying Tracked Objects
To display the currently congured objects used to track Layer 2 and Layer 3 interfaces, and IPv4 and IPv6 routes, use the following show
commands.
To display the conguration and status of currently tracked Layer 2 or Layer 3 interfaces, IPv4 or IPv6 routes, use the show track
command. You can also display the currently congured per-protocol resolution values used to scale route metrics when tracking metric
thresholds.
• Display the conguration and status of currently tracked Layer 2 or Layer 3 interfaces, IPv4 or IPv6 routes instance.
show track [object-id [brief] | interface [brief] | ip route [brief] | resolution | brief]
• Use the show running-config track command to display the tracking conguration of a specied object or all objects that are
currently congured on the router.
show running-config track [object-id]
Examples of Viewing Tracked Objects
Dell#show track
Track 1
IP route 23.0.0.0/8 reachability
Reachability is Down (route not in route table)
2 changes, last change 00:16:08
Tracked by:
Track 2
IPv6 route 2040::/64 metric threshold
Metric threshold is Up (STATIC/0/0)
5 changes, last change 00:02:16
Metric threshold down 255 up 254
First-hop interface is TenGigabitEthernet 1/2
Tracked by:
VRRP TenGigabitEthernet 2/30 IPv6 VRID 1
Track 3
IPv6 route 2050::/64 reachability
Reachability is Up (STATIC)
5 changes, last change 00:02:16
First-hop interface is TenGigabitEthernet 1/2
Tracked by:
VRRP TenGigabitEthernet 2/30 IPv6 VRID 1
Track 4
Interface TenGigabitEthernet 1/4 ip routing
IP routing is Up
3 changes, last change 00:03:30
Tracked by:
Object Tracking
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