Requesting an Automatic Bandwidth Allocation Adjustment

For MPLS LSP automatic bandwidth allocation adjustment, the minimum value for the adjustment interval is 5 minutes (300s). You might find it necessary to trigger a bandwidth allocation adjustment manually. The following describe a couple of scenarios when you might want to do this:

• Testing automatic bandwidth allocation in a network lab.
• When you configure the LSP for automatic bandwidth allocation in monitor mode (you have configured the monitor-bandwidth statement), you might want to initiate a bandwidth adjustment at your own discretion.

To use the request mpls lsp adjust-autobandwidth command, the following must be true:

• Automatic bandwidth allocation must be enabled on the LSP.
• The criteria required to trigger a bandwidth adjustment have been met (the difference between the adjust bandwidth and the current LSP path bandwidth is greater than the threshold limit).

A manually triggered bandwidth adjustment operates only on the active LSP path. Also, if you have enabled periodic automatic bandwidth adjustment, the periodic automatic bandwidth adjustment parameters (the adjustment interval and the maximum average bandwidth) are not reset after a manual adjustment.

For example, suppose the periodic adjust interval is 10 hours and there are currently 5 hours remaining before an automatic bandwidth adjustment is triggered. If you initiate a manual adjustment with the request mpls lsp adjust-autobandwidth command, the adjust timer is not reset and still has 5 hours remaining.

To manually trigger a bandwidth allocation adjustment, you need to use the request mpls lsp adjust-autobandwidth command. You can trigger the command for all affected LSPs on the router, or you can specify a particular LSP:

Once you execute this command, the automatic bandwidth adjustment validation process is triggered. If all the criteria for adjustment are met, the LSP’s active path bandwidth is adjusted to the adjusted bandwidth value determined during the validation process.

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