What loop prevention mechanism can be used for ospf type 3 sla in L3VPN. 12/19/2016 – by Mod_GuideK 0 What loop prevention mechanism can be used for ospf type 3 sla in L3VPN. A. sham link B. down bit SHOW ANSWERSCorrect Answer: B Explanation/Reference: Two options i recall were sham link and down bit