Oops, "ip ospf point-to-point" is the command I was thinking about, as
Lauren mentioned. Not point-to-multipoint.
versions needed as per http://www.cisco.com/warp/public/104/9.html#QB
On 27 Sep 2000 08:10:59 -0400, [EMAIL PROTECTED] (Clue Less) wrote:
>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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