Hi, Is there any info on RTBH on the DOC CD? I could only find this http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/prod_white_paper0900aecd80313fac.pdf http://packetlife.net/blog/2009/jul/6/remotely-triggered-black-hole-rtbh-routing/
and obviously this will not be available during the exam. I thought I understood the basic concept here but I am unable to get this to work without adding a route for the discard address on the trigger router. Both the links above only suggest that we add the route to null0 on the edge routers and only the route for the destination (victim) to be added on the trigger router. Destination RTBH ================= 1. Add route to null0 for the discard address on the edge routers 2. On the Trigger router Create a route map and match for a specific tag and set the next hop to that discard address. 3. As a best practice also set the origin to IGP (make it more preferred) and community to no-export (don't advertise outside the AS) 4. Add this route map for static redistribution under the BGP process on the trigger router. 5. Now when the victim in question is under attack then add a static route pointing to null0 with that tag on the trigger router so that this will be redistributed via BGP to the edge routers . Can you tell me what I am missing here? I am having to add a route for the discard addr on the trigger router as well which I do not see mentioned in any doc. -Srikant
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