Mitigate traffic congestions using tactical traffic engineered (TTE) tunnels

You can avoid congestions on oversubscribed links or domains using the dynamic tactical traffic engineered (TTE) tunnel solution. The dynamic TTE tunnel solution allows you to define congestion for a link by configuring high and low bandwidth thresholds. If the traffic load on the link exceeds the high threshold, then load-sharing is increased. If the traffic load falls below the low threshold, then load-sharing is decreased. 

The TTE solution helps you to: 

• Load-balance traffic towards destination prefixes using the congested outgoing interface or through a dynamically installed Tactical TE (TTE) tunnel.. 
• Monitor the cumulative load and subsequent deactivation of the TTE tunnel(s) when congestion is no longer detected. 

To enable congestion protection, include the congestion-protection statement at the [edit routingoptions] hierarchy level. Define high and low bandwidth thresholds by including the high-threshold and low-threshold statements at the [edit routing-options congestion-protection template template-name ] hierarchy level. You also need to include the export isis-export statement at the [edit protocols isis] hierarchy level. 

The TTE tunnel solution supports ISIS and uses TI-LFA backup routes for congestion mitigation.