From: Sean C (Upp_and_Upp@hotmail.com)
Date: Sun Apr 24 2005 - 21:22:54 GMT-3
Hi Dennis,
No, it is not required that a IPv6 net be longer than IPv4 net statement. A
IPv4 and IPv6 net statement follows the same rules.
Per CCO:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/iprrp_r/ip2_n1g.htm#wp1040484
A NET is a network service access point (NSAP) where the last byte is always
zero. On a Cisco router running IS-IS, a NET can be 8 to 20 bytes.
Also, as the links below show, an IPv6 net can be the same length as your
IPv4 net statement:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/ipv6_c/sa_isis6.htm#wp1036755
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/ipv6_c/sa_isis6.htm#wp1027258
I think it's more a force of habit - I haven't seen too many vendors that
use a 20 byte net.
HTH,
Sean
----- Original Message -----
From: "Dennis J. Hartmann" <dennisjhartmann@hotmail.com>
To: <ccielab@groupstudy.com>
Cc: "'Bob Sinclair'" <bsin@cox.net>
Sent: Sunday, April 24, 2005 7:49 PM
Subject: IPv6 ISIS NMC #2 Question
> Has anyone played with IPv6 ISIS? I was wondering if the NET NSAP is
> required to be 4 bytes larger. I'm reviewing NMC #2 and I see that the
> IPv4
> NET is 49.0001.3333.3333.3333.00 and the IPv6 NET is
> 49.0001.eeee.eeee.4444.4444.4444.00. I know that NSAP addresses are
> variable from 10 to 20 bytes, but I'm investigating the idea that the NSAP
> requirement is different from ISIS in IPv4 vs. IPv6. Thanks.
>
>
> Sincerely,
>
>
>
> Dennis J. Hartmann
>
> White Pine Communications
>
> dh8@pobox.com
>
> CCSI#23402/CCIP/CCNP/CCDP/CCNA/CCDA
>
> Cisco IP Voice Support & Design Specialist
>
> Cisco Optical, VPN & IDS Specialist
>
> MCSE
>
> _______________________________________________________________________
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