This has got to be the most confusing message I have ever read.
A loopback interface is just a virtual interface. It's not a real interface
it's just a virtual interface you can create within the router, and you can
create as many as you want.
The biggest reason someone would want to use a loopback interface would be
for resiliency. If you build a certain session to the loopback interface
(BGP, DLSW...) and you have more than one path to reach this router the
session will not die if a certain interface dies.
___________ ( )
------- r1 >>Brian
""Mark Odette II"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Just when I thought I understood Loopback interfaces, I decided while
> redesigning a network, that I would use them.... but now I'm questioning
my
> comprehension.
>
> Somebody clear the confusion for me- Please.
>
>
> This is what I'm wanting to do, but not sure if this is proper
utilization,
> much less whether or not it will work:
>
>
>
> RouterHQ connecting to 3 Remote Routers (branch offices) via FR Pvt
Network
> RouterHQ has 2 Ethernet Interfaces, but the Remotes Do NOT....They only
have
> one.
> (I think without pause: "No Problem, I can just create a Loopback
interface
> to take care of the other subnet.")
>
> The FR Pvt Network is only for Voice Traffic, while all data traffice will
> be going out another interface that is using IP UnNumbered Interface
> FastEthernet0.
>
> Here is where my quandry lays. I can't create a Secondary address, as I
> believe the IP UnNumbered command will use the primary address on the
> Ethernet Interface.
>
> So, can I create a Loopback interface, and treate it like a Ethernet
> interface, as such that I can assign an IP to the Loopback interface, but
it
> have a /24 mask, and other devices on the local network can also be keyed
> for the same subnet as the Loopback, making it where I can give the
command
> IP UnNumbered Lo0 to a Serial SubInterface??
>
> I thought I could, but then got concerned when I hopped on CCO, and did a
> lookup on Loopback interfaces, and read a blurb about traffic NOT destined
> for the LoopBack Interface itself will be routed to 'ye old trashcan'
i.e.,
> Null Interface.
>
> Somebody please tell me that I can send traffic from one end of the
circuit
> to the other and have it destined for a node OTHER than the Loopback
> Interface with that node being on the same subnet as the Loopback
interface.
>
> Thanks.
>
> Mark
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=38028&t=37933
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