IGP choice

Pablo Lucena plucena at coopergeneral.com
Fri Oct 23 19:35:54 UTC 2015

> 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'. ​

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