> A lot of carriers use ISIS in the core so they can make use of the' > overload bit' with a 'set-overload-bit on-startup wait-for-bgp". Keeps > them from black holing Traffic while BGP reconverges., when you have > millions of routes to converge it can take forever. It's also a really > handy tool when you're troubleshooting or repairing a link, set the OL > bit, and traffic gracefully moves, then when you're done it gracefully > moves back. You can do the same thing with the Metric, and Cost in OSPF, > just not quite as elegant. >
That feature is also present in OSPF. 'max metric router-lsa'.