Is SLAAC generation affected by non 64 bit size network prefix?

Question

I have enabled all the parameters needed for the generation of SLAAC, and I am obtaining router advertisement, but the network prefix in the router advertisement is /52 and not /64. The system is not getting assigned a SLAAC address. (Note that the router advertisement is in "Assisted" Mode (M+O+A flags), so that is not the issue). Should the network prefix be a /64 itself for SLAAC to be generated? How can I fix this issue?

Answer 1

In https://datatracker.ietf.org/doc/html/rfc4862#section-5.5.3 it is specified that:

If the sum of the prefix length and 
interface identifier length does not
equal 128 bits, the Prefix Information
option MUST be ignored.

For Ethernet the interface identifier length is 64 bits, so to comply with this rule the prefix must be a /64. Any other length will be ignored for the purpose of SLAAC.