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In this section:
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The Link Monitor object allows you to monitor a link for a specific interface and belongs to a link detection group. Link Monitor verifies transport on a specific interface via Layer 3 ICMP/ARP/NUD to a specific destination, or monitors the Media Independent Interface (MII) state for the physical port. A new Link Monitor is created on an interface for link verification. The Link Monitor is provided with a destination to use for link verification as well as the Link Detection Group to which it belongs. The Link Monitor is responsible for pinging that destination, processing responses and determining when the interface should be considered failed. It reports such failures to its Link Detection Group. The active and standby SBC should be connected to different physical hardware (that is, switches) to avoid a single point of failure. Each Link Monitor that is configured can also be configured with unique values for |
the Verify Timer, Response Timer, Reattempt Timer, |
and Retries. If configured, these values override the values configured for the Link Detection Group. Each Link Monitor will set |
a timer while waiting to perform its next verification. The timeout for this timer is based on the |
configured Verify Timer value. When a ping is in progress and the Link Monitor is awaiting the response from the destination, a timer is set based on the |
configured Response Timer value. When the response times out and the Link Monitor retries, |
the Reattempt Timer value is used while waiting for the response. When the number of consecutive failures reaches |
the Retries value, the Link Monitor considers the link verification as failed and reports this to its Link Detection Group. While in the failed state, the Link Monitor will continue to attempt to ping the destination so that the failed condition can eventually clear. This is done at the rate specified by |
the Verify Timer. The Link Monitor also supports a NULL destination (0.0.0.0), which disables the link verification for that interface. The interface is still considered failed if there is a hardware failure. To View Link Monitor ObjectsOn the SBC main screen, go |
to Configuration |
> System Provisioning |
> Category: Base |
Provisioning > |
Link Detection Group |
> Link Monitor. The Link Monitor window opens. Use the drop-down lists to filter |
by Address Context |
and Link Detection Group.
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To Create a Link MonitorTo create a new Link Monitor:
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Link Monitor Parameters:
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To Edit a Link MonitorTo edit any of the Link Monitors in the list:
To Copy a Link MonitorTo copy any of the Link Monitors in the list:
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To Delete a Link MonitorTo delete any of the Link Monitors in the list:
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