Can we Give IP address of Loopback interface as 1.1.1.1/32? and in ospf-2 router id 1.1.1.1 in same Router?

General
1

Can we Give IP address of Loopback interface as 1.1.1.1/32? and in ospf-2 router id 1.1.1.1 in same Router?

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Loopback address represent a standalone virtual interface. It is possible to configure an IP address on a loopback interface with subnet mask /32.
Yes, you can configure ip address 1.1.1.1/32 on a loopback interface. OSPF choose its router-id using the following steps:-

  1. Manual router-id
  2. Highest loopback interface ip address
  3. Highest physical interface ip address
    Again yes, you can use 1.1.1.1/32 as the router-id also on the same router.
    Hope it helps ! keep learning !