I recently had 32 bit networks inserting into our
EIGRP network caused by ppp on the WAN links and
remote users dialing in via ppp.
This was purely a ppp issue and was solved by
summarization.
Regards,
Phil.
--- Chuck Larrieu <[EMAIL PROTECTED]> 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.
>
>
=== message truncated ===
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