it is below command line we use for the management port to recover the switch?
ip vrf forwarding mgmtVrf
no ip address
There is a VRF on this router named mgmtVrf.
This port has been assigned to this vrf, so that it's routing information is completely separate from the global routing table on the router. ( I noticed there is no IP address on this interface, which makes this interface not very useful at the moment).
This is not a bad idea for management interfaces, where separation is desired for production transit traffic and management traffic.
I don't understand that how not ip-address to the interface separates the management traffic with the general traffic..
I mean we have to give them some IP-add..
Yes, you are right.
This interface is assigned to a VRF, and the interface has no ip address, and is not using IP unnumbered. This interface is not being used for L3 anything. It is possible that there are sub interfaces that exist, and those sub interfaces may or may not be assigned to the VRF, but in short, this physical interface without an IP address is not being used. We would need to add an IP to this interface for it to be useful.