From: router0160 (router0160@xxxxxxxxxxx)
Date: Sun Aug 19 2001 - 08:49:21 GMT-3
Dear all,
It's also the most headaches around me. I tried "summary-address" of OSPF on 12
.1.5 but it didn't work. Can I use "default-network" in lab exam? Pls advise.
Rgds,
Rol
>Jim,
>
>You are absolutely correct with your points below. However, to test this
>properly, you need to be working with a class B major network. Recall that
>IGRP has no problem with classful summaries. In your case, since R2 still
>considers those loopbacks as being in a different classful network, you will
>not have much of a problem injecting them into the IGRP domain.
>
>When practicing redistribution scenarios, use the same Class B address
>throughout your network. This is what causes the most headaches. In this
>case, you'll notice that either IGRP needs a default-network statement or
>you need to hack OSPF. This has been well-documented before, but I'd also
>like to point out that summary-address also has some code-dependencies. I
>believe that 12.0.XT does not support it (I'll have to double-check). Also,
>your ASBR must be mutually redistributing. That is, if R2 is only
>redistributing OSPF into IGRP and not vice versa, it will not work. The
>redistribute connected and summary-address combination on R1 is another
>possibility. Yet a third option is to use secondary addresses, disable
>split-horizon on the IGRP router and filter like crazy (very very dirty).
>
>That being said, understand that these "hacks" are a last-resort, because
>they are messy. When confronted with redistribution tasks on the lab, select
>the option that has the least impact on the rest of the network.
>
>Regards,
>Daniel Young
>CCIE #7999
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Jim Brown
>Sent: Friday, 17 August 2001 7:26 PM
>To: 'afiddler'; 'ccielab@groupstudy.com'
>Subject: RE: A cry for redistribution help! VLSM /28 into FLSM /24
>(summa ry-ad dress)
>
>
>I actually began to think I was going crazy until I realized this doesn't
>prove the summary-address works as proposed.
>
>You can remove the summary-address command and the 192.168.2.0 network will
>still appear in the IGRP domain. Why?
>
>Reason: During redistribution the IGRP process will advertise the route as a
>classful network by default. If it doesn't match the mask and major network
>of the outgoing interface, the process will advertise it as a major
>network... 192.168.2.0
>
>This is the only reason I can tell it is showing up in the IGRP domain. Try
>this same exercise with the 172.16.0.0 subnetted network.
>
>-----Original Message-----
>From: afiddler [mailto:afiddler@wi.rr.com]
>Sent: Friday, August 17, 2001 4:47 PM
>To: Jim Brown
>Subject: Re: A cry for redistribution help! VLSM /28 into FLSM /24
>(summary-ad dress)
>
>
>HTH
>
>R1
>interface Loopback0
> ip address 192.168.2.1 255.255.255.252
> ip ospf network point-to-point
>!
>interface Loopback1
> ip address 192.168.2.5 255.255.255.252
> ip ospf network point-to-point
>!
>interface Loopback2
> ip address 192.168.2.9 255.255.255.252
> ip ospf network point-to-point
>interface FastEthernet0
> ip address 192.168.3.1 255.255.255.252
> no ip mroute-cache
> speed auto
>!
>router ospf 1
> log-adjacency-changes
> network 192.168.2.0 0.0.0.3 area 0
> network 192.168.2.4 0.0.0.3 area 0
> network 192.168.2.8 0.0.0.3 area 0
> network 192.168.3.0 0.0.0.3 area 1
>
>R2
>interface Ethernet0
> ip address 192.168.3.2 255.255.255.252
> no ip directed-broadcast
>!
>interface Serial1
> ip address 192.168.4.1 255.255.255.252
> no ip directed-broadcast
>!
>router ospf 1
> summary-address 192.168.2.0 255.255.255.0
> network 192.168.3.0 0.0.0.3 area 1
>!
>router igrp 1
> redistribute ospf 1 metric 10000 1000 255 1 1500
> network 192.168.4.0
>
>sh 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, * - candidate
>default
> U - per-user static route, o - ODR
>
>Gateway of last resort is not set
>
> 192.168.4.0/30 is subnetted, 1 subnets
>C 192.168.4.0 is directly connected, Serial1
> 192.168.2.0/30 is subnetted, 3 subnets
>O IA 192.168.2.8 [110/11] via 192.168.3.1, 00:02:19, Ethernet0
>O IA 192.168.2.0 [110/11] via 192.168.3.1, 00:02:29, Ethernet0
>O IA 192.168.2.4 [110/11] via 192.168.3.1, 00:02:19, Ethernet0
> 192.168.3.0/30 is subnetted, 1 subnets
>C 192.168.3.0 is directly connected, Ethernet0
>
>interface Serial1
> ip address 192.168.4.2 255.255.255.252
> no ip directed-broadcast
>!
>router igrp 1
> network 192.168.4.0
>
>sh 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, * - candidate
>default
> U - per-user static route, o - ODR
>
>Gateway of last resort is not set
>
>S 172.20.0.0/16 is directly connected, Null0
> 192.168.4.0/30 is subnetted, 1 subnets
>C 192.168.4.0 is directly connected, Serial1
>I 192.168.2.0/24 [100/9476] via 192.168.4.1, 00:01:14, Serial1
>I 192.168.3.0/24 [100/8576] via 192.168.4.1, 00:01:14, Serial1
>
>----- Original Message -----
>From: "Jim Brown" <Jim.Brown@CaseLogic.com>
>To: <ccielab@groupstudy.com>
>Sent: Friday, August 17, 2001 4:52 PM
>Subject: A cry for redistribution help! VLSM /28 into FLSM /24 (summary-ad
>dress)
>
>
>> On my quest for redistribution knowledge, this has escaped me.
>>
>> I have searched high and low, through the archives, in Usenet, and on the
>> Cisco web site to no avail.
>>
>> This discussion has gone on forever and I cannot replicate it with any
>> consistency.
>>
>> How do you use the summary-address command at the redistribution point to
>> summarize longer masks into shorter masks?
>>
>> Everyone tells me it works, but not for me. Am I missing something? Are
>> there gothcas escaping me?
>>
>> I'm throwing in the towel and begging for help. I pray the redistribution
>> Gods will smile on me and offer enlightenment.
>>
>> Scenario in question:
>>
>> Area0--R1--Area1--R2--IGRP--R3
>>
>> I have a couple of LoopBack interfaces in Area 0 with a /30. I attempting
>to
>> summarize them in to a /24 for successful redistribution into IGRP. I
>apply
>> the summary-address command on R2, but they won't appear in the R2 IGRP
>> update, or on R3 if you could imagine that.
>>
>> I know the summary-address command is documented for summarization INTO
>OSPF
>> on an ASBR, but there is so much talk about using it in the reverse that I
>> feel left out of the party.
>>
>> I know I can use an area range command on an ABR for summarization
>upstream.
>>
>> I know I can inject a default route into the FLSM to provide reachability.
>>
>> All this I know, but what I want to use is the summary-address command.
>> HELP!
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