Chuck,
The SPF/neighbor/database stuff of OSPF will pretty much look the same as if
its routes were inserted in the table; the thing is that the OSPF routes
will be sitting around looking bored because they are NOT in the routing
table... kind of like my high school years when no one would dance with
me...thanks, Chuck, for bringing up painful memories!
LOL
Charles
""Chuck Larrieu"" <[EMAIL PROTECTED]> wrote in message
002701c027eb$8a5073a0$[EMAIL PROTECTED]">news:002701c027eb$8a5073a0$[EMAIL PROTECTED]...
> Would you guys cut it out!!!!!
>
> Now I've got another lab idea to try out, to whit: if you install OSPF
over
> EIGRP, what will the OSPF side of things look like? I.e. the spf tables? I
> am confident in predicting that the routing table will contain only the
> EIGRP routes, because those would be preferred due to lower admin
distance.
> ( all other things being equal )
>
> Such a lab would, of course, be of little practical use. Just another
> distraction to satisfy my idle curiosity.
>
> Geez, this will be another late night on the routers, I can tell.
>
> Chuck
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> Cthulu, CCIE Candidate It's Not Dagon
> Sent: Tuesday, September 26, 2000 11:29 AM
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: Re: Migrating from EIGRP to OSPF
>
> Hey, Brian,
>
> Thanks for the info. I have some comments/clarification.
>
>
> >EIGRP carries a lower administrative distance vs. EIGRP.
> CR: You mean EIGRP (90) has a lower AD than OSPF (110)?
>
>
> So you can
> >basically turn up OSPF on your routers, and then when it all looks
kosher,
> >what I would do is raise the administrative distance of EIGRP above
> >OSPF..........this will cause the EIGRP routes to phase out and OSPF to
> >be used. If it all goes crazy........you can revert by simply moving
> >EIGRP back to the default administrative distance. If you were to have
> >cleared out your EIGRP config......it would be difficult to put things
> >back..........
>
> CR: That is an excellent suggestion! It would be easy to write a script
> that lower/raise as needed. Thank you!
>
>
> >Ok, why would a more specific route be inserted in OSPF vs. EIGRP? If
you
> >deploy your OSPF to match that of your EIGRP, this should not
> >happen.......its definitly avoidable.
>
> CR: I was not clear on this. What I meant to say was that if EIGRP has a
> more specific/longest match route than OSPF (or vice versa), that route
will
> be inserted in the routing table rather than the OSPF route. Recalling
past
> groupstudy discussions, a learned route gets inserted in the routing table
> in order of preference of:
>
> 1. Most specific/longest match
> 2. administrative distance
> 3. cost (metrics)
>
>
> I had a situation where a more specific EIGRP route stayed in the routing
> table even though adjustments has been made to prefer OSPF. For example,
if
> you enter a network 1.1.1.1 0.0.0.0 area 0 command under OSPF, the mask
that
> gets advertised with this route by OSPF is whatever mask you have on the
> interface. Another thing is that if you advertise loopback interfaces,
OSPF
> treats them as stub hosts (with a /32 mask); therfore, the route from
OSPF
> will be inserted in the routing table as it is more specific/longest
match,
> rather than the same route learned from EIGRP with its lower
administrative
> distance. These are the types of problems I want to minimize.
>
>
> Many thanks, Brian, for the suggestions and feedback!
>
> Charles
>
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