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By default, the highest and lowest VLAN IDs indicate the status of the physical connection. These VLAN IDs are always monitored and a connectivity failure in either initiates a failover. In most deployments this is the desired setting, as it supports the primary purpose of the feature (detecting a connectivity failure) and the traffic generated on the network is light. However, this setting only detects VLAN configuration problems on the switch for the highest and lowest VLAN IDs.
