LTE: How does MME select PGW for a PDN connectivity request receives from an UE ?

Question

In the deployed network,

Answer 1

MME will have static IP list for each PDN, MME will pick default PDN if UE doesn't give anything otherwise it picks the PDN which UE includes.

Comments

Are you sure, carrier grade MME maintain such kind of static details ?

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:) This is implementation specif, this is how we maintain :)