All the "O" routes are more specifc than the "D" routes, so they are
suppose to be in the routing table. I'm assuming they're ip addresses
on loopback interfaces with /24 mask. You may want to try putting "ip
ospf network point-to-multipoint" (if the version of IOS support this)
and see if it makes a difference.
Clue.
On 27 Sep 2000 01:07:08 -0400, [EMAIL PROTECTED] ("Chuck Larrieu")
wrote:
>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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