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Re: ATM Clip Addressing Question posted 01/23/2000
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Denton,

You are pretty much on track. The example you quoted with "random" ATM
address won't work. Quite frankly, I was'nt able to make that example work
either. From a configuration perspective, ATM NSAP address is a 20 byte
address and is divided into three major parts. ATM Prefix, ESI, and the
Selector.  ATM Prefix is a 13 byte field, ESI is a 6 byte field, just like
the MAC address, and the Selector is a 1 byte field. Thats all you have to
remember regarding NSAP addresses.

ATM Prefix should be obtained from the ATM Switch i.e. LS1010 using "atm pvc

1 0 16 ilmi" command. PVC number 16 has a special meaning and is documented
as a "well known" for ILMI. ILMI is a Management PVC to retrieve
configuration information from the Switch such as the Address Prefix.

Use "atm esi address" command to assign any 7 byte address for ESI and the
Selector if not already provided to you. I generally use the router number
as the esi address if configuring the major interface unless provided
otherwise.

Use "atm pvc 1 0 5 qsaal" command to instruct the ATM interface to use PVC 5

as a signally PVC. QSAAL is the type of signal and PVC 5 is a "well known"
PVC for signalling.

So if you have two Routers connected via LS1010 switch, you would use the
following:

Router 1 -- Acting as an Arp Server
int atm 0
    atm pvc 1 0 5 qsaal -- Signalling PVC
    atm pvc 1 0 16 ilmi -- Management PVC
    atm esi address 111111111111.11
    atm arp-server  self  -- This interface act as an ARP Server for this
Router.


Router 2 -- Acting as an Arp Client
int atm 0
    atm pvc 1 0 5 qsaal -- Signalling PVC
    atm pvc 1 0 16 ilmi -- Management PVC
    atm esi address 222222222222.22
   atm arp-server  111111111111.11  -- This interface act as an ARP Client
point to the
                                             Router1's ATM NSAP address to
talk to the ARP Server.


As you noticed, there is no need to configure an entire 20 byte NSAP
address. Once you configure an ILMI PVC 16 and do "no shut" on an interface
you should receive the first 13 bytes of the ATM address from the Switch
called the Prefix. This Prefix will automatically be prepended to your 7
byte ESI/Selector address. Hence providing a complete 20 byte NSAP Address.
You can see what that address is by performing "show lane default" command.


Hope this helps.

Naushad Prasla

Denton Bobeldyk wrote:

> Ok, I'm feeling more and more confident with the ATM commands, but
> I'm having a problem swallowing this whole NSAP stuff.
>
> If I am given a router with an ATM interface and am asked
> to configure that interface for ATM Clip.
> It would appear to me that I would have to go through the following
> steps (according
> to the Doc CD):
>
> interface atm 0
>  ip address 10.0.0.1 255.0.0.0  <--- Assign it an IP address
>  atm nsap-address ac.1533.66.020000.0000.0000.0000.0000.0000.0000.00
> <-- **See Note 1**
>  atm rate-queue 1 100   <-- Don't think I really need this
>  atm pvc 1 0 5 qsaal   <-- This does something for my SVCs
>  atm arp-server  <-- This tells the network that I am going to be the
> arp-server.  aka translate the IP
>             addresses to ATM addresses.
>
> **Note 1:  This is where I get stuck.  I am under the impression that
> you can simply create this
> NSAP address out of thin air... Are there any rules you have to follow?
>
> One you have this scenario up and running how can you check to make sure
> it's doing
> what's supposed to be doing?  (i.e. what 'show' commands)
> Now in theory I should be able to ping another IP address on this ATM
> cloud or setup routing
> to it correct??
> Any quick responses would be most appreciative!!!
>
> -Denny
>
> --
> -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
> Denton Bobeldyk MCNE, CCDA, CCNA, CCSI
> Email: denny@xxxxxxxxxxxxxx
> Phone: 616-530-9196
>
> Master CNE - Connectivity
> Cisco Certified Design Associate
> Cisco Certified Network Associate
> Cisco Certified Systems Instructor
>
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