ip unnumbered Loopback0 tunnel mode mpls traffic-eng tunnel destination 192.168.1.8
tunnel mpls traffic-eng path-option 10 dynamic tunnel mpls traffic-eng auto-bw tunnel mpls traffic-eng bandwidth 750
The configuration changes that auto bandwidth makes are like a configuration change you make by hand. The configuration is not saved, so unless you have saved it yourself, after the router is reloaded, the configured bandwidth is not there on reload.
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