I have a question on this task and the supplied solution. The part of the question that puzzles me is
"Configure R1 to single black holing for its Loopback 12 interface. Use ping to 150.140.130.120 to verify this." The solution in the workbook only has unicast RPF checking enabled on the interface towards the BB1 on R7 where 150.140.130.120 is based. This is in answer to the first part of 5.2 interface FastEthernet0/0.1107 encapsulation dot1Q 1107 ip address 11.11.7.7 255.255.255.0 ip verify unicast source reachable-via rx allow-default ip policy route-map Force-TE However the RPF checking is not enabled on the interfaces which receive the traffic from R1. So a packet from L12 to 150.140.130.120 will leave to BB1 however the return traffic will be dropped due to the Null route. I do not think this is how you would want blackholing to work. I do not think this is correct, should loose RPF checking on both inbound interfaces connecting R7 to R6 and R8 ? I say loose RPF checking as TE in a later question forces traffic inward over a non RPF interface yet there is still an route to the source. Thanks and regards Kevin
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