From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Sep 17 2003 - 01:18:10 GMT-3
Your ESI can be registered with the ATM switch dynamically
through ILMI. However, this is not to say that your ESI address is
arbitrary. First you must ensure that your ESI address is unique to the
switch you are connected to. Next, you must ensure that the switch does
not have a static route for this NSAP address pointing to another
interface. Also, if the other end point of the network has a static
mapping for your NSAP address, your NSAP address must match what they
are expecting.
Using the ESI address is really just a shortcut for not having
to type in your switch prefix. In a public ATM network, you will be
assigned an NSAP address.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 708-362-1418 (Outside the US and Canada)
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> ccie2be
> Sent: Tuesday, September 16, 2003 9:39 PM
> To: Group Study
> Subject: ATM - What ESI address to enter?
>
> Hi all,
>
> On page 570, in Practical Studies, it says, "The prefix is obtained
> automatically from the immediately attached ATM switch by using ILMI.
> Various
> options are available for the ESI assignment-you can use the MAC
address
> of
> one of the attached LAN interfaces of a router, or you can assign an
> arbitary
> address coinciding with the interaface's IP address. For example, if
the
> IP
> address of the ATM interfaces (or subinterface) is 177.10.168.1, you
can
> assign the ESI to be 0177.1016.8100."
>
> A friend says this is wrong and reminds me that Solie's book is full
> mistakes.
> He also told me that he knows that the ESI address entered must be
what
> the
> ATM is expecting from first hand experience. He was doing a practice
lab
> and
> couldn't establish connectivity until he entered on the router the
> specific
> ESI configured on the directly attached ATM switch.
>
> I'm hoping someone can settle this and explain why the right answer is
> right.
>
> Thanks in advance. dt
>
> ***Get your CCIE and a FREE vacation: Shop.GroupStudy.com***
>
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