Canonical loop
A canonical loop is a pair of pages that each declare the other as canonical.
Why it matters
Neither page can be indexed, because neither is ever the authoritative version. It is usually caused by two normalisation rules disagreeing.
How it is measured
Follow the canonical from any page in the suspected loop and check whether you return to the origin within two hops.
Checks that involve canonical loop
Related terms
Questions
What is canonical loop?
A canonical loop is a pair of pages that each declare the other as canonical.
Why does canonical loop matter?
Neither page can be indexed, because neither is ever the authoritative version. It is usually caused by two normalisation rules disagreeing.
How is canonical loop measured?
Follow the canonical from any page in the suspected loop and check whether you return to the origin within two hops.