Dell Force10 TeraScale C Series, Справочное руководство

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Object Tracking | 995
Parameters
Defaults None
Command Modes CONFIGURATION
Command
History
Related
Commands
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.
If the next-hop address in the ARP cache ages out for a route tracked for its reachability, an attempt is
made to regenerate the ARP cache entry to see if the next-hop address appears before considering the
route DOWN.
object-id
Enter the ID number of the tracked object. Range: 1 to 65535.
ip-address/
prefix-len
Enter an IPv4 address in dotted decimal format. 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.
Version 8.4.1.0 Introduced
show track Display information about tracked objects, including configuration, current state, and
clients which track the object.
track ip route
metric threshold Configure object tracking on the threshold of an IPv4 route metric.