What is the difference between loopback ip and management Ip ?

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Feb 2nd, 2008
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Dear All,

Please clarify me about the differences between loopback ip and management ip,s.


when we login to router or switch, we use management ip. what is the purpose of the loopback ip. and briefly explain about loopback ip.

thanks,

raj

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Edison Ortiz Sat, 02/02/2008 - 19:27
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The management IP can be the loopback IP. Any IP address assigned to a switch can be a management IP as you can telnet to the switch on any available IP.


Often, a management Vlan is created in multi-layer switches so you can single-out traffic to/from the switch for management purposes.


On a Layer2 switch, you are only allowed to have one Layer3 address and that's the management IP.



As for the loopback, it's often created since the interface is always up/up. The management IP under the switch virtual interface, relies on the port status to be active in order for the interface to be up/up.


For instance, if you have a management Vlan of 100, you need to have a switchport in up/up state with trunking enabled and Vlan100 in forwarding mode -or- a switchport configured as access-mode for Vlan100 and status up/up.



HTH,


__


Edison.

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