From: Jeff Omick (jomick@xxxxxxxxxx)
Date: Fri Mar 10 2000 - 22:22:19 GMT-3
> Richard Wagner wrote:
>
> Hello All,
>
> I've got a virtual circuit coming in on an ATM connection. I want to apply a
n
> IP address to it and reach another IP host on the other side. I will need
> broadcast functionality on this connection. For the moment, I'm unaware of
> any NSAP or E.164 address that I may have, but it is entirely possible that I
> could get one from the switch.
IF you have ILMI turned on the switch will provide the prefix and you will
supply the ESI.
>
> What's the right way to accomplish this? I have a lot of experience in ATM
> LANE and Frame Relay, but this one is not making sense to me. I don't have
> the equipment to do hands-on studying with ATM
>
> So far, I've figured that I have to apply an ATM map-class to the interface t
o
> associate the IP address with the VC. That mapping should include a broadcas
t
> parameter.
>
> What "atm PVC" or "atm SVC" command should I use to define the virtual circui
t
> on the interface?.
atm pvc - This is provided by your service provider. It only has local
significance.
consider this to be very frame-relay like.
atm svc - This is alittle different. Since ATM is not a broadcast media you
have to
map ip addresses to atm addresses. There are acouple ways to map the i
p
addressed to atm address the first would be to statically map them via
a map
statement (sorry i do no know all the syntax just giving ways of doing
it).
The second way of maping ip addresses to atm addresses is to have an ar
p
server. This arp server would contain a central location of static map
ped ip
to atm addresses. All of your endpoint would just have to know the add
ress of
the arp server it would then ask the arp server where is ip address x
the arp server would resolve the atm address and the router could then
place an svc circuit to the destination atm address. In the call
proceeding message of the svc handshaking is where you will get your vp
/vc
number it will be dynamic based on vp/vc ranges of your switch.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios11/cbook/catm.htm
this document should cover configuration of the atm arp server/client commands.
> Should I use a subinterface? I'm stretching my Frame Relay knowledge over
> here by asking that question.
Follow subinterface guidlines like you would frame-relay same apply here.
>
> Should I use the well-known VCs for ILMI and QSAAL? Are they necessary?
ILMI is used for address registration. The switch will give you the prefix
and you will supply the esi. (just like lane)
QSAAL is the layer between ATM and the Q.2931 layer (signalling layer for
svc's). Q.SAAL ensures data delivery of upperlayer sigalling messages
will retransmit if there are any errors.
>
> Will I need to mess with any of the ATM addressing?
don't know.
>
> In all... what do I need to do to get that IP host on the other side of that
> VC coming in?
PVC's configure both sides with VP/VC and map like frame-relay
this can be done without a ATM switch.
SVC's see explantion above ATM switch needed.
>
> Thank you all for your help, I hope to return the favor to the other lemmings
> someday :)
You can help me in the LANE department i am very week there... actually I am
week
in alot don't know how i'm ever going to get though this.
>
> Richard Wagner
Hope this helps
Jeff Omick
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