A loopback interface will only go down if the entire router goes down.
Loopback interfaces should be used for OSPF, BGP, and DLSw+. For instance,
when a loopback interface is used on a router using OSPF, the highest
number IP address on a loopback interface is used as the Router ID. If
the Router ID was on a physical interface and that interface failed, the
OSPF process could experience a Router ID change. If the router has a new
Router ID, the other routers will treat it as a new and different router.
This result would be that all OSPF routers affected would have inaccurate
information in their topological database.
Doug
Hans Schimek wrote:
> Hi !
>
> in the last few sample configurations i came across the term LOOPBACK.
> what is this device needed for and why do i have to specify this.
> concerning FRAME RELAY or ISDN for example.
>
> thanx a lot
>
> ===============================
> Hans Schimek
>
> Student
>
> Fachhochschule St. Pölten f.
> Telekommunikation und Medien
>
> mailto: [EMAIL PROTECTED]
> gsm : +43 676 / 6389357
> gsm : +43 699 / 10227980
> icq : 22308773
> fax : +43 3613 / 23114
> www : www.schimek.net
>
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