IPv4 Bogon and Martian addresses are not blocked.

From Perimeter Router Security Technical Implementation Guide Cisco

Rules

SV-47835r2_ruleInbound packets using IP addresses specified in the RFC5735 and RFC6598, along with network address space allocated by IANA, but not assigned by the RIRs for ISP and other end-customer use must be blocked, denied, or dropped at the perimeter device.

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