Label switched path preemption avoidance

A method comprising:

• determining, by a router, whether a link is congested based at least in part on an amount of available bandwidth on the link;
• and
• responsive to determining that the link is congested:
• setting, by the router, a bandwidth subscription for the link, wherein the bandwidth subscription specifies a respective amount of bandwidth available for each different label switched path priority level from a plurality of different label switched path priority levels such that the amount of available bandwidth on the link for label switched paths having priority levels that satisfy a lower priority level threshold is less than an amount of available bandwidth on the link and less than the amount of available bandwidth on the link for label switched paths having priority levels that do not satisfy the lower priority level threshold;
• and
• responsive to setting the bandwidth subscription, sending, by the router and to at least one other router in a network, an indication that a first amount of bandwidth is available for the label switched paths having priority levels that satisfy the lower priority level threshold and that a second amount of bandwidth is available for the label switched paths having priority levels that do not satisfy the lower priority level threshold, wherein the first amount of bandwidth is less than the second amount of bandwidth, and wherein the first amount of bandwidth is less than the amount of available bandwidth on the link.