From: Brian McGahan (brian@cyscoexpert.com)
Date: Wed Mar 26 2003 - 21:46:08 GMT-3
Jim,
The NET addressing format is as follows:
AA.AAAA.AAAA.AAAA.AAAA.AAAA.AAAA.SSSS.SSSS.SSSS.nn
Where A is area, S is system-id, and n is nselector. The maximum length
of the NET 160 bits, the minimum length is 64 bits. The length has to
be uniform throughout the entire IS-IS domain. The system-id can be
anything you want, as long as it is unique to the area.
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Toll Free: 866.CyscoXP
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> ccie2be
> Sent: Wednesday, March 26, 2003 3:44 PM
> To: Group Study
> Subject: IS-IS NET clarification
>
> Hi,
>
> I hope this isn't a silly question.
>
> In Doyle's book, he says that usually the NET is made up from the area
ID
> with
> the MAC address appended to it.
>
> I'm wondering is this a rule or a suggestion? And, if it's a rule,
does
> it
> matter which MAC address is used?
>
> Since the NET in ISIS is comparable to the Router ID in OSPF and
applies
> to
> the router as a whole, it seems to me it shouldn't matter what MAC
address
> is
> used. And, taking that 1 step further, if it doesn't matter what MAC
> address
> is used, perhaps it doesn't matter if a MAC address is used at all.
>
> Please set me straight on this. Thanks, Jim
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