What message is shared between the initial X2 connections to the MME?

Mobility
1

Hi Experts.

What message is shared between the initial X2 connections to the MME?

2

X2 has no connection to MME is between eNodeBs.

3

It is not X2 connection, but initially eNB can discover IP address of a neighbour eNB using configuration transfer message when ANR is used.