Adjusting the threshold of autobandwidth based on the absolute value for LSP

Current autobandwidth threshold adjustment is done based on the configured percentage, which is hard to tune to work well for both small and large bandwidth reservations. For a given threshold percentage, when the bandwidth reservation is small there can be multiple LSP resignalling events. This is because the LSP is responsive to even minor increase or decrease in the utilization when current reservation is small. For example, a small threshold adjustment of 5 percent allows large LSPs of say 1G to respond to changes in bandwidth of the order of 50M. However, that same threshold adjustment results in too many LSP resignalling events for small LSPs of say 10M reservation. Increasing the adjust threshold percentage by for example 40 percent minimizes LSP resignaling for small LSPs. However, large LSPs do not react to bandwidth usage changes unless they are huge, for example, 400M. You can configure an absolute value based threshold along with the percentage based threshold that helps avoid the bandwidth getting triggered for LSPs of both small and large bandwidth reservations. Configure adjust-threshold-absolute value option at the [edit protocols mpls label-switched-path lsp-name auto-bandwidth] hierarchy level.