08-12-2011 01:35 PM
While doing some testing on a PA pair at a new site, I noticed that at least one type of configuration change would apparently cause OSPF to reset and lose all of the routes out of the site. Specifically, I was enabling and disabling IPv6 on interfaces. When I would commit the change, the site would drop communications for thirty seconds or so until the OSPF neighbors started talking again. (At least that's what it looked like was causing it.)
I've tried other policy and routing changes (remove and add IPv4 addresses from an interface, create and destroy L3 sub-interfaces, add and remove static routes), and none of those have seemed to cause OSPF to reset.
Once this site is up and running in production, a thirty second blip would be a big deal. Does anyone know for sure what kinds of configuration changes are safe and not safe to make with respect to interrupting the dynamic routing protocols? (Can anyone else confirm enabling and disabling IPv6 causes disruption? Or is it just me?)
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