Anyone would like to explain why using VRF interface as management?

[wfqk]

Anyone would like to explain why using VRF interface as management? Without the VRF interface, what will happen? Thank you

[Philip D'Ath]

You can use a VRF for management if you want your management network separated from your main network.  It is like having a virtual out of band network.

If you don't want to have a separate management network that is fine (and this is very common in small to medium sized networks), then you can just use the default global vrf.

[Joseph W. Doherty]

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Anyone would like to explain why using VRF interface as management?

For security reasons similar to why a L2 switch's management IP might be in a dedicated VLAN.

Without the VRF interface, what will happen?

Management IP should then be in the default global VRF, likely shared with other hosts that aren't just management IPs.  (Much like a manageable switch that doesn't support VLANs, or defaulting to using VLAN 1.)