3.4.2 Bandwidth violation notification

The bandwidth violation notification function periodically monitors the increase in the number of bandwidth violation frames (maximum bandwidth violation or minimum bandwidth violation) of QoS entries for which bandwidth monitoring is being performed, and sends operation messages and SNMP notifications. This section explains the bandwidth status and monitoring period of the target QoS.

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(1) Bandwidth status

The bandwidth violation notification periodically monitors the bandwidth violation frame count for each QoS entry that is the target of bandwidth violation notification, and determines the bandwidth status. The bandwidth state includes the bandwidth compliance state and the bandwidth violation state. The initial state is the bandwidth compliance state.

A QoS entry whose bandwidth status changes also notifies the change of the bandwidth status.

(a) Transition from bandwidth compliance state to bandwidth violation state

The transition from the bandwidth compliance state to the bandwidth violation state is performed based on the number of bandwidth violations and the number of monitored bandwidth violations set by the configuration command.

When the target QoS entry is monitored periodically and the number of bandwidth violation frames increased from the previous monitoring count (bandwidth violation count) reaches the specified bandwidth violation count, the status changes to the bandwidth violation status. If the state is not changed to the bandwidth violation state by the set number of monitoring times, the bandwidth compliance state is continued, the bandwidth violation count and monitoring count are reset to the initial value, and the operation is restarted.

(b) Transition from bandwidth violation state to bandwidth compliance state

The transition from the bandwidth violation state to the bandwidth compliance state is performed based on the bandwidth compliance count and the monitoring count set by the configuration command.

If the target QoS entries are monitored periodically and the number of bandwidth violation frames does not change from the previous monitoring (bandwidth compliance count) reaches the specified bandwidth compliance count, the status changes to bandwidth compliance status. If the state is not changed to the bandwidth compliance state by the specified number of monitoring times, the bandwidth violation state is continued, the bandwidth compliance count and monitoring count are reset to the initial value, and the operation is restarted.

(2) Monitoring interval for bandwidth violation notification

Use the configuration command to set the monitoring interval for bandwidth violation notifications. QoS entries for which bandwidth violation is reported are monitored for the number of entries set by the configuration command per second.

For example, if you use the configuration command to set the number of entries to 100 and the number of target QoS entries for bandwidth violation notification is 110, the command monitors 100 entries in the first second and the remaining 10 entries in the second.

When a member switch is configured, each member switch monitors QoS for which bandwidth violation is reported.

(3) Bandwidth State Transition Example

The following figure shows the sequence when the bandwidth state changes. In this example, the bandwidth state transitions from the bandwidth compliance state to the bandwidth violation state and then from the bandwidth violation state to the bandwidth compliance state. The number of bandwidth violations is set to 2, the number of monitors is set to 3, the number of bandwidth violations is set to 4, and the number of monitors is set to 5 in the bandwidth compliance state.

Figure 3-4: Bandwidth state transition sequence