i have a C7600 with SUP720/PFC3BXL running 122-33 SRB2 (advanced enterpr.). It is necessary to configure NAT between 2 interfaces belonging to the same VRF. It works fine for TCP traffic but not for UDP traffic. There is a CAVEAT for UDP traffic and NAT on the SUP720/PFC3A (IOS 12.2SXF) that looks like the behavior i am observing in the above described situation. Does anyone about some similar limitation for the HW/SW i am using. I didn't find any reference so far in the docs.
UDP NAT issue should be fixed in PFC3B and PFC3BXL. But you are trying to use "VRF aware NAT" here, I am not sure if it can be done. As far as I know, you might need to use FWSM.
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