North American Network Operators Group
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RE: bgp route-map

  • From: Michel Py
  • Date: Mon Aug 25 19:43:46 2003 
> Haesu C. wrote:
> However: On prefixes being announced to me INBOUND, is there a
> feature to set in route-map so that it checks whether the
> advertised prefix is already existing in local RIB?

If I understand correctly, what you want is the same as conditional advertisements:
http://www.cisco.com/en/US/tech/tk365/tk80/technologies_configuration_example09186a0080094309.shtml
except that it needs to be applied to received routes instead of advertised routes.

In other words, it's not enough for you to dump the bogon traffic in a blackhole; you also want to dump bogonish routes received from your peers before they even get to your RIB.

If I understood it right, a na�ve look at it would be that since the function already exists in the other direction it should not be too big of a deal to do it the other way, but I'm not the one compiling IOS.

Michel.