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A new Link Monitor is created for each interface that is configured 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. You must configure link monitors for the active and standby SBC with different destinations, to avoid a failure scenario where the active and standby SBC fail back and forth due to link detection failures caused by loss of communication with a single destination. The active and standby SBC should be connected to different physical hardware (that is, switches) to avoid a single point of failure.
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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.
Link Monitor monitors a link verifies transport on a specific interface via Layer 3 ICMP/ARP/NUD to a specific destination for a specific interfaceor monitors MII state for the physical port, where MII is defined as “Media Independent Interface”.
To View Link Monitor
On SBC main screen, go to Configuration > System Provisioning > Category: Base Provisioning > Link Detection Group > Link Monitor. The Link Monitor window is displayed.
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| 0 | Table |
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| 1 | Link Monitor Parameters |
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Parameter | Description |
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Name
| Specifies the name of this Link Monitor Group. | Physical Port | Physical port associated with the IP interface to be monitored. In a redundancy configuration, pkt0_p is paired with pkt0_s and pkt1_p is paired with pkt1_s. pkt0_p – Primary packet 0 port.pkt0_s – Secondary packet 0 port.pkt1_p – Primary packet 1 port.pkt1_s – Secondary packet 1 port.
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This parameter is only visible on systems. |
| Interface Group | Specifies the name of the IP Interface Group to be monitored. | Interface | Specifies the name of the IP or management interface to be monitored. | Note |
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IP or MGMT interface can be configured, depending on the type that is configured for the Link Detection Group. |
| Destination
| Specifies the destination IP Address for link verification. | Note |
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The Destination IP Address must be within the same subnet as the source interface. |
| Verify Timer
| Specifies the time interval (in milliseconds) between the link verification attempts | Response Timer
| Specifies the time to wait (in milliseconds) for a link verification attempt. | Reattempt
Timer
| Specifies the time to wait (in milliseconds) for a link verification re-attempt. | Retries
| Specifies the number of re-tries before the link verification is considered failed. | State
| Specifies the administrative state for this link monitor. | Probe On Standby | Use this flag to enable/disable probing on the Standby port for the specified Link Monitor. disabled – Use this option to disable probing on Standby port when the router does not respond properly to the ARP/NUD probes. For additional details, see "Link Detection Support" topic at SBC Redundancy.enabled (default) – Use this option to allow probing on Standby port when the Link Monitor is configured for the Active port.
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This flag is only visible on systems and used when Router cannot reply to the ARP probe with a required unicast destination MAC address. |
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To Copy Link Monitor
To copy any of the created Link Monitor and to make any minor changes, click the radio button next to the specific Link Monitor to highlight the row.
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