This counter tracks prefix consistency queries that were iterated back to the master, authoritative database by the checker, rather than being resolved against the local copy alone. A rising iteration count suggests the checker frequently needs to fall back to the master database to resolve or confirm entries, which could point to a distributed FIB copy that's drifting more than expected from the master. On a distributed-CEF platform, if a particular line card's checker shows a disproportionately high iteration count compared to its peers, that card's local FIB copy may be diverging more often and warrant closer inspection.