Just an update; service provider did not provide us /29. What we did was to utilize the 2nd 4G uplink (MG21) so that MX1 gets two uplinks ( fiber + 4G) , and MX2 ends up with 1 uplink (4G). We made sure that both MX1/MX2 are connected to a LAN switch with trunk ports for keep alive mechanism. We dropped MX1 and failover worked.
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