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loopback interface

hi

,can anyone help me int he concept of loopback interfaces. where are they used other than in ospf router ids?

what kind of trouble shooting can we do with them

4 REPLIES
Cisco Employee

Re: loopback interface

Hello Krishna,

Loopback interfaces are being used to provide a stable address for protocols (eg. routing protocols, tunnels, ...).

Because a loopback interface is not connected to any hardware, a loopback interface is always up and the IP address therefore can always be used.

HTH,

Bert

Cisco Employee

Re: loopback interface

A loopback interface is a stable IP address as the link cannot go down. That's why it is used for example as an Identifier (ID) for routing protocols. More importantly, they are used in BGP/MPLS networks as a next-hop IP address for prefixes and endpoints of pseudowires. For example, in MPLS VPN networks, the loopback address of the egress PE router is the next-hop IP address of the BGP prefixes (MPLS VPN or VRF prefixes).

Regards,

Luc

New Member

Re: loopback interface

thanks Ideghein

New Member

Re: loopback interface

thanks bert

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