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Dell EMC SmartFabric OS10 User Guide Release 10.5.1

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Host tracking

If you configure an IP host as a tracked object, the entry or next-hop address in the ARP cache determines the Up or Down state of the route.

A tracked host is reachable if there is an ARP cache entry for the router's next-hop address. An attempt to regenerate the ARP cache entry occurs if the next-hop address appears before considering the route Down.

  1. Configure object tracking in CONFIGURATION mode.
    track object-id
  2. Enter the host IP address for reachability of an IPv4 or IPv6 route in OBJECT TRACKING mode.
    [ip | ipv6] host-ip-address reachability
  3. Configure the time delay used before communicating a change in the status of a tracked route in OBJECT TRACKING mode.
    delay [up seconds] [down seconds]
  4. Track the host by checking the reachability periodically in OBJECT TRACKING mode.
    reachability-refresh interval
  5. View the tracking configuration and the tracked object status in EXEC mode.
    show track object-id
Configure IPv4 host tracking
OS10 (conf-track-1)# track 2
OS10 (conf-track-2)# ip 1.1.1.1 reachability
OS10 (conf-track-2)# do show track 2
IP Host 1.1.1.1 reachability
Reachability is DOWN
1 changes, Last change 2017-04-26T06:45:31Z
OS10 (conf-track-2)#
Configure IPv6 host tracking
OS10 (conf-track-2)# track 3
OS10 (conf-track-3)# ipv6 20::20 reachability
OS10 (conf-track-3)# delay up 20
OS10 (conf-track-3)# do show track 3
IP Host 20::20 reachability
Reachability is DOWN
1 changes, Last change 2017-04-26T06:47:04Z
OS10 (conf-track-3)#

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