This reports the auto-sizing mode configured for this tunnel, determining the algorithm or strategy (e.g. how aggressively it grows or shrinks) governing its bandwidth adjustments. An admin checks this to understand whether the tunnel's bandwidth changes conservatively in small steps or more aggressively in larger jumps, which affects how quickly it responds to sudden traffic surges versus how much it might overreact to brief spikes. For example, a more conservative mode would grow bandwidth gradually across several evaluation intervals rather than jumping straight to the configured maximum on a single traffic spike.