Cisco IOS XR Configuration Manual page 131

Implementing IPSec Network Security on Cisco IOS XR Software
This IPSec feature is supported only on the Cisco IPSec VPN SPA.
Note
Disabling IPSec NAT Transparency
This task disables NAT transparency if you already know that your network uses IPSec-awareness NAT
(spi-matching scheme).
SUMMARY STEPS
1.
2.
3.
configure
crypto nat-transparency disable
end
or
commit
How to Implement General IPSec Configurations for IPSec Networks
Cisco IOS XR System Security Configuration Guide
SC-119