Mr. Chuck,
Thank you for experiementing on our behalf... my routers are in a warehouse
in Maryland somewhere and won't arrive in Texas for another month. But,
enough about me and my problems...
Those /32 routes are most likely your loopback interfaces on the router
routers; OSPF advertises all loopback addresses as /32 regardless of what
mask you actually apply (it teats loopback interfaces as stub hosts).
Since this /32 is a more specific/longest match than the /24 advertised by
EIGRP, it will be inserted in the routing table. You change the AD,
metrics, costs, etc. until the cows come home in a drunken stupor; those
loopback addresses with their /32 mask will still be inserted in the routing
table.
You are also probably going to discover the benefits/problems of using/not
using "auto-summary" under EIGRP when deploying OSPF and the effect of using
network x.x.x.x 0.0.0.0 area x in OSPF to put an intgerface with a VLSM mask
into the OSPF routing process. I won't say anymore...the joy of discovery
is more than the discovery itself;)
Many thanks, and I look forward to your next posting... please keep us
informed!!
Charles
""Chuck Larrieu"" <[EMAIL PROTECTED]> wrote in message
006001c02840$5db16a20$[EMAIL PROTECTED]">news:006001c02840$5db16a20$[EMAIL PROTECTED]...
> Well, I couldn't resist. I had the router pod set up for a RIP to EIGRP
> migration test yesterday. I am not sure that the results will soothe your
> concerns, Mr. Cthulu.
>
> I would post configurations, but the file size exceeds what Paul allows.
> Those who are interested, contact me off line, and I will send you a text
> file with configurations and routing tables.
>
> Following is a routing table resulting from placing OSPF onto a router
> already running EIGRP. Note that OSPF routes with a mask of /32 are being
> placed into the routing table. I am not sure why this is happening.
Several
> tweaks have failed to eliminate these routes. Nor did changing the EIGRP
> distance to 115 ( higher than OSPF's 110 ) eliminate EIGRP routes from the
> routing table.
>
> So now I have to wonder what is happening.
>
> If no one has a quick and good explanation, I'll try to post configs and
> fool with this some more. Possibly I can place the routers on line and let
> folks poke around
>
> Look forward to some more discussion. Customer visits tomorrow, so I won't
> be back on line until very late in the day.
>
> Chuck
>
>
> Router# show ip route
> Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
> area
> * - candidate default, U - per-user static route, o - ODR
> P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> 192.168.8.0/24 is variably subnetted, 2 subnets, 2 masks
> D 192.168.8.0/24 [90/2809856] via 192.168.254.5, 23:15:32, Serial1
> O IA 192.168.8.1/32 [110/129] via 192.168.254.5, 00:05:44, Serial1
> 192.168.9.0/24 is variably subnetted, 2 subnets, 2 masks
> O IA 192.168.9.1/32 [110/129] via 192.168.254.5, 00:05:45, Serial1
> D 192.168.9.0/24 [90/2809856] via 192.168.254.5, 23:15:32, Serial1
> 192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
> D 192.168.10.0/24 [90/2809856] via 192.168.254.5, 23:15:33, Serial1
> O IA 192.168.10.1/32 [110/129] via 192.168.254.5, 00:05:46, Serial1
> 192.168.11.0/24 is variably subnetted, 2 subnets, 2 masks
> O IA 192.168.11.1/32 [110/129] via 192.168.254.5, 00:05:46, Serial1
> D 192.168.11.0/24 [90/2809856] via 192.168.254.5, 23:15:33, Serial1
> 192.168.4.0/24 is variably subnetted, 2 subnets, 2 masks
> D 192.168.4.0/24 [90/2297856] via 192.168.254.5, 23:15:34, Serial1
> O IA 192.168.4.1/32 [110/65] via 192.168.254.5, 00:05:47, Serial1
> 192.168.5.0/24 is variably subnetted, 2 subnets, 2 masks
> O IA 192.168.5.1/32 [110/65] via 192.168.254.5, 00:05:47, Serial1
> D 192.168.5.0/24 [90/2297856] via 192.168.254.5, 23:15:34, Serial1
> 192.168.6.0/24 is variably subnetted, 2 subnets, 2 masks
> D 192.168.6.0/24 [90/2297856] via 192.168.254.5, 23:15:34, Serial1
> O IA 192.168.6.1/32 [110/65] via 192.168.254.5, 00:05:47, Serial1
> 192.168.7.0/24 is variably subnetted, 2 subnets, 2 masks
> O IA 192.168.7.1/32 [110/65] via 192.168.254.5, 00:05:47, Serial1
> D 192.168.7.0/24 [90/2297856] via 192.168.254.5, 23:15:34, Serial1
> C 192.168.0.0/24 is directly connected, Loopback0
> 192.168.254.0/24 is variably subnetted, 3 subnets, 2 masks
> C 192.168.254.4/30 is directly connected, Serial1
> D 192.168.254.0/24 is a summary, 23:15:36, Null0
> D 192.168.254.0/30 [90/2681856] via 192.168.254.5, 23:15:35, Serial1
> C 192.168.1.0/24 is directly connected, Loopback1
> C 192.168.2.0/24 is directly connected, Loopback2
> C 192.168.3.0/24 is directly connected, Loopback3
> Router#
> Router#
>
> -----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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