From: John Darpino (john.darpino@gmail.com)
Date: Thu Dec 30 2004 - 11:25:22 GMT-3
Duly noted, Scott. Should've been more specific. So within the context
of vanilla RIP the class (and gleaned routemask) are determined by
the first three bits if a more specific route is unavailable. Any
classful boundary action, such as summarization, would be based on
this, because there is no route mask information communicated.
ie: local router shows
10.10.10.248/29
remote router shows RIP reported downstream network as:
10.0.0.0/8
That's what I'm looking for, guys. Thanks for your help.
On Wed, 29 Dec 2004 16:20:02 -0800, Andy Mrozek <AndyMrozek@yahoo.com> wrote:
> I say option 1 ..... If you look at most classful protocols such as igrp
> / rip 1 ... They always take only the original as defined "Classfull"
> network definition , which is defined by the first few bits , so when
> ipv4 was being developed they had to be fair , and have a solution to
> give the most efficient netblock to requesting orgs ... So I believe
> everything is still off of that original classfull definition so this
> reinforces option 1 which you stated it is a "Class A network , using X
> number of subnet bits" I like this option also because it is less
> confusing.... And preserves history.. Hope you win
>
> MADMAN wrote:
>
> > Scott Morris wrote:
> >
> >> The first three bits really define class... And that term is not
> >> exactly
> >> compatible with "subnet"... So I really would need to say it depends on
> >> context, or that you have a definitional and contextual problem!
> >>
> >>
> >> Scott Morris, MCSE, CCDP, CCIE4 (R&S/ISP-Dial/Security/Service Provider)
> >> #4713, JNCIP, CCNA-WAN Switching, CCSP, Cable Communications
> >> Specialist, IP
> >> Telephony Support Specialist, IP Telephony Design Specialist, CISSP
> >> CCSI #21903
> >> swm@emanon.com
> >>
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> >> Of John
> >> Darpino
> >> Sent: Wednesday, December 29, 2004 2:47 PM
> >> To: gstudy
> >> Subject: Classful Boundaries.
> >>
> >> OK you big heads. Someone explain this to me.
> >>
> >> Does the term "classful boundary" currently refer to:
> >>
> >> A: The range into which a given addr falls that differentiates it
> >> from one
> >> that falls into another, ie:
> >>
> >> This network, 10.10.10.248/29 is a Class A subnet.
> >> (since 10.x.y.z falls under the pre CIDR class A)
> >
> >
> > I would say this is most correct. it would be more correct to state
> > that 10.10.10.248/29 is a subnetted class A in classful thinking.
> >
> > Dave
> >
> >>
> >> OR
> >>
> >> B: The bit boundary closest to the bitmask in eight bit increments, ie:
> >>
> >> This network, 10.10.10.248/29 is a Class C subnet.
> >> (since the closest bit boundary is /24)
> >>
> >> You will be settling a bet, so DON'T gimme that "both answers are
> >> right" or
> >> "it depends on the context" or "just let the cat go unharmed and
> >> we'll sort
> >> all this out without police involvement" stuff.
> >>
> >> Which interpretation is more relevent?
> >>
> >> --
> >> Entropy - it's a tough job, but somebody's got to undo it.
> >>
> >> _______________________________________________________________________
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> >
>
>
-- Entropy - it's a tough job, but somebody's got to undo it.
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