On Thu, 14 Aug 2008, Jon Lewis wrote:
if it does, that means their backbone has gone down. Do a few
traceroutes
and you will quickly figure out what are their backbone CIDRs to use.
That's basically what I ended up with yesterday in the simulator. My problem
with it is, without inside knowledge of my upstream networks, how do I know
which routes will never go away or never even just change mask?
To be safer, if I end up doing this, I'll probably put half a dozen or so
networks from each upstream in the access-list.
I suggest tracking one block and not a few. Finding the right one takes
about 30 minutes of traceroutes from various LGs.
-Hank
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