I'll try to answer this one, and I hope it makes it through. My last three
posts to the list haven't made it on.
A point to point circuit is dedicated for your use. You don't have to worry
about congestion in your provider's network causing you to lose data between
sites. The down side is that you lose flexibility. The config is as simple
as you want it to be.
Router A:
interface serial 0
description To Router B
encapsulation hdlc ! this is the default
ip address 10.1.1.1 255.255.255.0
Router B:
interface serial 0
description To Router A
encapsulation hdlc ! Again, this is default
ip address 10.1.1.2 255.255.255.0
And that's about it for that. With frame relay, you have a T1 between your
site and the provider's network. Your physical circuit can then be further
broken down into what is called Permanent Virtual Circuits, or usually,
PVCs. The nice thing about this approach is that the PVCs can have entirely
separate and unrelated endpoints, which provides a lot of flexibility. One
downside to this approach is that you are now a slave to the conditions of
your provider's network. If it gets congested, you run the chance of losing
data. To avoid data loss, you pay more for a higher CIR, or Committed
Information Rate. This is a guaranteed amount of bandwidth that you agree
to pay for. Any bursting over that limit is not guaranteed to arrive if the
network is congested.
A simple config for three routers might look like this:
Router A:
interface serial 0
encapsulation frame-relay
interface serial 0.16
description To Router B
ip address 10.1.1.1 255.255.255.0
frame-relay interface-dlci 16
interface serial 0.17
description To Router C
ip address 10.1.2.1 255.255.255.0
frame-relay interface-dlci 17
Router B:
interface serial 0
encapsulation frame-relay
interface serial 0.16
description To Router A
ip address 10.1.1.2 255.255.255.0
frame-relay interface-dlci 16
interface serial 0.17
description To Router C
ip address 10.1.3.1 255.255.255.0
frame-relay interface-dlci 17
Router C:
interface serial 0
encapsulation frame-relay
interface serial 0.16
description To Router A
ip address 10.1.2.2 255.255.255.0
frame-relay interface-dlci 16
interface serial 0.17
description To Router B
ip address 10.1.3.2 255.255.255.0
frame-relay interface-dlci 17
Ok, it's that simple if you want it to be. I left out some things for the
sake of clarity and I hope I didn't make any mistakes. If I did, someone
please correct me. I only got three hours of sleep last night and I
shouldn't be configuring anything off the top of my head!
A couple of things to notice about these configs: first, the subinterface
numbers can be anything you want. I could have used "interface serial 0.67"
if I'd wanted, but it's a good practice to make the subinterface number
match the dlci, which you get to pick most of the time but sometimes it will
be provided to you. The first usable dlci number is 16, so I used that in
these configs.
Second, the dlci has only local significance. This means that if dlci 16 on
router A leads to router B, on router B's end it doesn't have to be dlci 16.
It could just have easily been dlci 95. It's entirely irrelevant.
I hope that helps, and that I answered your question. I probably went off
on a tangent and answered questions you weren't asking, but that's only
because I really, REALLY need some sleep!
Good luck!
John Neiberger, CCNA/CCDA
> Can some clearly explain the difference, I have
> checked the Archives and not found a good explanation.
> Also if you have some sample configs, that would be a
> great help to me.
> Thank you.
>
> =====
> JZ
> [EMAIL PROTECTED]
>
>
>
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