From: Volkov, Dmitry (Toronto - BCE) (dmitry_volkov@xxxxxxxxx)
Date: Mon Aug 05 2002 - 19:08:10 GMT-3
Armand,
Ok, now it is clear. no mystique :)
r6 < 12.1(3) - it's why you have LSA 5 in database when you redistributed
connected
and hence can summarize this lsa 5 using summary-address
despite You have "network 135.4.34.0 0.0.0.7 area 1" in r6
lab ios is 12.1 so this will not work on the lab, i guesss...
area 0 range command on r4 works as supposed to work
about this:
"My test says no static route to null0 generated by any
routing protocol...."
area range and summary-address generate this static to null automaticaly
after 12.1(6)
put "no discard-route internal" under router ospf on r4
Dmitry
-----Original Message-----
From: Armand D [mailto:ciscoworks2001@yahoo.com]
Sent: Monday, August 05, 2002 4:56 PM
To: Volkov, Dmitry (Toronto - BCE)
Cc: ccielab@groupstudy.com
Subject: RE: OSPF into IGRP using Summarization solution
Dmitry,
I don't understand. I came into the office today and
clear ip ospf process and clear ip ro * and everything
works. My /27 routes magicly appeared as /24.
Again here is the config:
Router 6 Version 12.0(5)XK2 (ASBR router)
Router 4 Version 12.1(5)T7 (ABR backbone router)
"area 0 range 135.4.24.0 255.255.255.0"
The /24 routes shows up on R6 as a "IA" route. On R4
it says route 135.4.34.0/24 is a summary, 00:00:03,
Null0....
My test says no static route to null0 generated my any
routing protocol....How do I prevent this ?
Thanks,
Armand
--- "Volkov, Dmitry (Toronto - BCE)"
<dmitry_volkov@ca.ml.com> wrote:
>
> William,
>
> I don't understand a cople things in your solution..
>
> 1)Why do You need another IGP running on tunnel ?
> As soon as You build 135.4.36.0/29 tunn between r5 &
> r6 - it became part of
> IGRP
> because igrp is running on 135.4.0.0
> Since Armand put mutual igrp/ospf redistr on R6,
> ospf will know new /29
> network as well.
>
> r5 will learn routes /29 from major class 135.4.0.0
> as soon as you have tunn
> /29.
> What the point to have another IGP ???
>
> 2) question to Armand.
> You did redistr connected on r6 and the same time
> have network
> network 135.4.34.0 0.0.0.7 area 1 under ospf on r6.
> as Eric B. noticed it should not work if you have
> 12.1(3) or higher
> because:
> In Cisco IOS Software Release 12.1(3) and later, the
> Type-5 LSAs are no
> longer created for connected networks INCLUDED in
> the network statements
> under router OSPF.
>
>
http://www.cisco.com/warp/public/104/redist-conn.html
>
> I checked it on 12.1.(15) and 12.1(5)T12 - it's
> true.
>
> What is IOS on r6 ?
>
> 3) And finally:
> You CAN summarize INTRA-area 0 routes towards (i.e.
> routes originated from
> within area 0)
> towards to area 1 if you put "area 0 range" command
> on r4.
> Router creates summary to Null automaticaly, and
> this aggregate will be
> propagated
> to area 1 ONLY, it will NOT appears in any OTHER
> area of your ospf domain.
>
> 135.4.24.0/27 - this is internal area 0 network "O"
> isn't it ?
>
> Dmitry
>
>
> -----Original Message-----
> From: William lu [mailto:mailluw@yahoo.com]
> Sent: Monday, August 05, 2002 12:56 AM
> To: Armand D; ccielab@groupstudy.com
> Subject: Re: OSPF into IGRP using Summarization
> solution
>
>
> Hi Armand,
>
> In order to verify the solution for this issue, I
> built your scenario with the TUNNEL solution and it
> works just fine.
>
> The problem in your configuration is you can not use
> summary address in R6 to summary a OSPF route out of
> OSPF domain. Also you can not use area range to
> summarize 135.4.24.0/27 for area 0 in R4. Too long
> to
> explain why here.
>
> Solution:
> 1. Build a tunnel between R5 and R6 with any IGP
> protocols other than IGRP and OSPF. Then, send
> 135.4.36.0/29 frm R5 to R6 and redistribute into
> ospf
> as external route in R6.
> 2. Redistribute 135.4.24.0/27 as connected route
> with
> route-map (it works in 12.1) into ospf domain.
> 3. At this point, you should have both routes in
> your
> ospf database as external routes by verifying with
> ip
> ospf database command.
> 4. Finally, you can use following two commands in R6
> to summarize them into 24bit class routes:
> summary-address 135.4.24.0 255.255.255.0
> summary-address 135.4.36.0 255.255.255.0
> 5. You should see two classful routes in R5's
> routing
> table as follows:
>
> R 135.4.24.0/29 [120/1] via 150.4.1.2, 00:00:02,
> Tunnel0
> O E2 135.4.24.0/24 [110/20] via 139.11.12.1,
> 00:00:03,
> Serial0
> O E2 135.4.36.0/24 [110/20] via 139.11.12.1,
> 00:00:03,
> Serial0
> C 135.4.36.0/27 is directly connected, Loopback10
> R 198.172.20.0/24 [120/2] via 150.4.1.2, 00:00:04,
> Tunnel0
>
> This could be pne of few solutions to make your
> scenario works. It is too long to explain why to can
> not use other ways to work around. Please contact
> Cyscoexpert.com if you need to learn more in detail
> for IGP redistribution. They are the best CCIE
> training center I knew.
>
> Let me know if it works.
>
> William
>
>
> --- Armand D <ciscoworks2001@yahoo.com> wrote:
> > Hello,
> >
> > This is a tough one to get working. I have three
> > routers one running IGRP the other two in OSPF. I
> > have
> > searched the archives for solutions and still
> can't
> > get this one to work. Router 5 shows all area 1
> > networks /29 with help of "summary-address"
> > command. Router 5 does NOT see any Area 0 /27
> routes
> > in routing table.I have tried the "area 0
> > range" command on R4 with no luck. Please look
> > at
> > my configs and tell me what I'm missing here.
> >
> > Any help would be appreciated.
> >
> > R5
> > |
> > |
> > 135.4.56.0/24 IGRP
> > |
> > |
> > R6
> > |
> > |
> > 135.4.36.0/29 OSPF Area 1
> > |
> > |
> > R4
> > |
> > 135.4.24.0/27 OSPF Area 0
> >
> >
> >
> > ====================================
> > hostname R5
> > !
> > ip subnet-zero
> > !
> > interface Loopback0
> > ip address 135.4.5.5 255.255.255.0
> > no ip directed-broadcast
> > !
> > interface Ethernet0/0
> > ip address 135.4.56.5 255.255.255.0
> > no ip directed-broadcast
> > !
> > router igrp 10
> > network 135.4.0.0
> > !
> > ip classless
> > !
> > end
> >
> > ===================================
> > hostname R6
> > !
> > ip subnet-zero
> >
> > interface Loopback0
> > ip address 135.4.6.6 255.255.255.0
> > no ip directed-broadcast
> >
> > interface Loopback200
> > ip address 135.4.66.6 255.255.255.0
> > no ip directed-broadcast
> > ip ospf network point-to-point
> > !
> > interface Serial0/0
> > description to R4
> > ip address 135.4.34.6 255.255.255.248
> > no ip directed-broadcast
> > encapsulation frame-relay
> > ip ospf message-digest-key 2 md5 secure
>
=== message truncated ===
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:17 GMT-3