What does the part of the log, “% SEC-6-IPACCESSLOGP”, extracted from a Cisco router represent?

The system was not able to process the packet because there was not enough room for all of the desired IP header options

Immediate action required messages

Some packet-matching logs were missed because the access list log messages were rate limited, or no access list log buffers were available

A packet matching the log criteria for the given access list has been detected (TCP or UDP)