4.1.6 Tracking track
The policy-based routing tracking functionality allows you to use the configuration commands to stop track operation and specify the track state of the stopped track. Thus, when adding or changing the track configuration, you can fix the track state to minimize the impact on route selection of the linked policy-based routing group, and start track operation at a time when route selection is less affected.
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(1) Default track state
The default track state is the track state that is applied when a track is stopped. You can use the default-state configuration command to apply the default track state to each track. The default track state is Down for tracks that are not specified by the configuration command.
The configuration of the default track state is valid even for stopped tracks and tracks with incomplete configuration. Therefore, if you specify the default track state in advance, you can change the track configuration without affecting route selection of the policy-based routing group linked with tracks.
(2) Stopping a Track by Configuration
Specify the disable configuration command to stop operation for a track. The track state of the stopped track is the default track state.
(3) Track whose configuration is not completed
Tracks with incomplete configuration are those tracks for which the track type is not specified. Therefore, tracks for which the track-object or type icmp configuration command value is not specified.
Even tracks with incomplete configuration can be linked with the policy-based routing group. If such a track is linked with the policy-based routing group, the default state of that track is used as the result of polling monitoring of the tracking functionality, to determine whether the route can be used for forwarding.
(4) Track Behavior at Switch Startup
When the Switch starts or restarts, the polling monitoring track stops for a certain period of time. This is because monitoring by polling cannot be performed immediately after startup of the Switch for the following reasons:
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The VLAN interface is not in the Up state.
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The routes are not stable.
The track operating status after the Switch is started or restarted until polling monitoring track starts operation is called Starting. In the Starting status, the default track state is set.
The time that can elapse before the polling monitoring track starts operation after the Switch is started or restarted can be changed for each device by using the track-object default-init-interval configuration command. Specify the time required until communication using the polling monitoring track is stable after the Switch is started or restarted. The default is 180 seconds.