OS10 Enterprise Edition User Guide Release 10.4.1.0

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Host tracking

If you configure an IP host as a tracked object, the entry or the 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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