which three are loop prevention mechanisms?

When redistributing routes from MP-BGP to OSPF, which three are loop prevention mechanisms? (Choose three)

When redistributing routes from MP-BGP to OSPF, which three are loop prevention mechanisms? (Choose three)

A.
Tag field.

B.
Down bit.

C.
Time To Live field

D.
Site of Origin field

Explanation:

The tag field prevents cross-domain routing loops for lsa type 5 Site of origin is used when multible customer sites are using the same AS and therefore use "as-override" or "allow-as" has been configured. It is not relevant to OSPF



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