You gotta admire a man with dedication.
--
James Haynes
Network Architect
Cendant IT
A+,MCSE,CCNA,CCDA,CCNP,CCDP
""John Neiberger"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hey, not a bad idea! The Cubbies and Sammy Sosa are in town to get
> punished by the Rocks. That would be a nice little getaway.
> Unfortuntely....you guessed....CCIE study group meeting tonight. ;-)
>
> >>> "James Haynes" 4/24/01 1:30:48 PM >>>
> John,
>
> Have you considered going out to a movie, ballgame, or anything else
> that
> might get you away from your routers for a few hours? :-)
>
> --
> James Haynes
> Network Architect
> Cendant IT
> A+,MCSE,CCNA,CCDA,CCNP,CCDP
> ""John Neiberger"" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > I have received results from a TAC case about this familiar issue.
> For
> > those coming late to the picnic, the issue was that the presence of
> OSPF
> > or IS-IS overrides 'no ip classless' in the router configuration and
> > would force the router to behave classlessly. The TAC engineer
> > consulted with some Development Engineers and here is what they
> said:
> >
> >
> >
> > Yes, we do this if the default (or the supernet) route
> > is supplied by OSPF or ISIS (I guess EIGRP should be there,
> > but it is not) and the part of the code that requested
> > the RT lookup didn't not specify to ignore the default
> > route if there's no specific subnet (which is the case
> > for the locally originated and transit packets).
> > The assumption is that it is safe to use a default/supernet
> > route installed by a classless protocol.
> >
> > So what ever you and me have seen in our testing is correct
> behaviour.
> >
> >
> >
> > So, our original guesses were correct. The router assumes that if
> > we're running OSPF or IS-IS then we want classless routing even if
> we
> > didn't specify 'ip classless' in the config. However, an important
> > point is that this applies only if the supernet was installed by the
> > classless protocol. If OSPF or IS-IS is running on a router but the
> > supernet was installed by another process, then classful routing
> would
> > still apply without the addition of 'ip classless' to the config.
> >
> > I've also discovered that if you add 'ip clueless' to the config,
> the
> > following occurs:
> >
> > First, ip classless is overridden but only in cases where no ip
> > classless was manually configured previously and was not the default
> > setting, unless the router has not had any previous configuration and
> is
> > running at least 12.1(5F)T12. This does not apply for any 12.0
> images
> > except 12.0(6)S but does apply to any 11.2 image after 11.2(26c)P;
> >
> > Second, the gateway of last resort might be chosen by the RT lookup
> > process if the GOLR was set by a classless routing protocol with an
> > administrative distance lower than that of any other classless or
> > classful routing protocol on the router, except in the case of BGP
> or
> > EGP in which case the administrative distance must be at least equal
> to
> > that of the routing protocol which previously installed the GOLR, if
> > already present;
> >
> > Thirdly, if the lowest-weighted routing protocol is OSPF and the
> GOLR
> > is advertised to neighbor as an E2 route, then the neighbor router
> may
> > choose to use that route unless another neighbor has advertised the
> same
> > supernet route as an E1 route. In which case--but especially when
> > utilizing IP over Avian Carriers (with QoS)--the RT lookup will
> choose
> > the Type 1 External route unless EIGRP is running on this router as
> > well. In that case, the GOLR will be set via EIGRP because Cisco
> > prefers EIGRP to OSPF and we should all use that anyway because,
> don't
> > ya know, OSPF is harder to configure and requires way too much
> thought
> > to begin with. IS-IS is just out of the question. However, if a
> router
> > learns a supernet route via OSPF and IS-IS *and* EIGRP then you will
> be
> > severely punished. Flogging is generally suggested. As an
> alternative,
> > only run EIGRP and leave "ip clueless" configured.
> >
> > Any other configuration will provide ambiguous results.
> >
> > HTH,
> > John
> > FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to
> [EMAIL PROTECTED]
> FAQ, list archives, and subscription info:
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> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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