From: Joel W. Ekis (jekis@xxxxxxxxx)
Date: Thu Apr 06 2000 - 08:53:57 GMT-3
Ryan:
A couple of issues on what you are trying.
For default-network to function you need to choose a Classful network that is n
ot in use in the IGRP domain. You are trying to use 10.128.0.0 which is a port
ion of the Class A network 10.0.0.0. This is already assigned to your IGRP dom
ain. You must use some other network in the OSPF router's table. By network I
mean the Classful type, not a subnet. If you choose a subnet of that other ne
twork, it will also generate a null0 route in the OSPF router, but you will get
the gateway of last resort in the IGRP router.
All the examples that I have seen from the others are using Class B networks in
the default-network command. That is why their's work and your's doesn't. As
I understand it, you cannot get this to work using a single Classful address s
pace.
I don't have direct experience with GK class, but I would guess that they used
two different Classful networks in their lab.
Joel
At 02:07 PM 4/5/2000 -0700, Ryan B wrote:
>Guess someone needs to let Global Knowledge know they are teaching
>incorrectly... What happens in 11.2 (11.3 too?) is that a static route to
>null0 for the summary-address is added. With this route now added, IGRP
>natively announce the network, it's not redistributed from OSPF. When you
>reboot the router the route is no longer there so IGRP no longer sees the
>route (at least from what I've seen)... But still, even if the static route
>stayed, you now have a static route in your table, how is the proctor going
>to like that?
>
>In 12.0 it doesn't add this null0 route so summary-address doesn't work at
>all... The route in question is 10.128.0.0/16 coming from another OSPF
>router...
>
>7206_D#wr t
>[...]
>router ospf 64
> summary-address 10.128.0.0 255.240.0.0
> redistribute igrp 64 subnets route-map igrp_to_ospf
> network 10.80.0.0 0.15.255.255 area 0
>!
>router igrp 64
> redistribute ospf 64 route-map ospf_to_igrp
> passive-interface FastEthernet0/0
> network 10.0.0.0
> default-metric 512 2000 255 1 1500
>!
>access-list 20 deny 10.80.0.0
>access-list 20 deny 10.96.0.0
>access-list 20 deny 10.112.0.0
>access-list 20 permit any
>access-list 30 permit 10.96.0.0
>access-list 30 permit 10.112.0.0
>route-map igrp_to_ospf permit 10
> match ip address 30
>!
>route-map ospf_to_igrp permit 10
> match ip address 20
>[...]
>7206_D#
>
>7206_F#sh ip route
>[...]
>Gateway of last resort is not set
>
> 10.0.0.0/12 is subnetted, 4 subnets
>I 10.64.0.0 [100/21541] via 10.96.1.1, 00:00:19, FastEthernet0/0
>I 10.80.0.0 [100/120] via 10.96.1.1, 00:00:19, FastEthernet0/0
>C 10.96.0.0 is directly connected, FastEthernet0/0
>C 10.112.0.0 is directly connected, FastEthernet1/0
>7206_F#
>
>
>Now, on 7206_D we just add "ip route 10.128.0.0 255.240.0.0 Null0" and
>remove the summary-address command
>
>7206_F#sh ip route
>[...]
>Gateway of last resort is not set
>
> 10.0.0.0/12 is subnetted, 5 subnets
>I 10.64.0.0 [100/21541] via 10.96.1.1, 00:00:24, FastEthernet0/0
>I 10.80.0.0 [100/120] via 10.96.1.1, 00:00:24, FastEthernet0/0
>C 10.96.0.0 is directly connected, FastEthernet0/0
>C 10.112.0.0 is directly connected, FastEthernet1/0
>I 10.128.0.0 [100/21541] via 10.96.1.1, 00:00:24, FastEthernet0/0
>7206_F#
>
>
>-Ryan
>
>
>----- Original Message -----
>From: "Henry Steuart" <henry@resourcenetworks.com>
>To: "Ryan B" <rbenigno@home.com>; <stanley_seow@rbrnet.com.sg>
>Cc: <ccielab@groupstudy.com>
>Sent: Tuesday, April 04, 2000 1:17 PM
>Subject: Re: OSPF into IGRP
>
>
>> Ryan
>>
>> Sorry to be obstinate, but as anyone who has completed Geotrain's [now
>> Global Knowledge] ANEW1 will tell you, the summary addresses DO work when
>> redistributing OSPF into IGRP. This is [one of the things] they are
>> designed to do. At least under 11.2(15).
>>
>> As you correctly assert, summary addresses can ALSO be used to summarize
>> INTO ospf at an ASBR.
>>
>> I know of AT LEAST 2 CCIEs on this list that can confirm this for you.....
>>
>> Regards
>> Henry Steuart
>> CCSI #97174
>>
>> At 04:01 PM 4/5/00, Ryan B wrote:
>> >This does *NOT* work.... summary-address is used for redistribution into
>> >OSPF from other protocols.. The fact that it even kinda works (until you
>> >reboot from what I've seen) is more of a bug then anything... In fact, I
>> >just tried it on 12.0 and I doesn't even "kinda" work, but it did in
>11.2.
>> >
>> >Again, unless you have multiple classful networks to work with there is
>no
>> >way to get this done without static routes.
>> >
>> >----- Original Message -----
>> >From: "Henry Steuart" <henry@resourcenetworks.com>
>> >To: <stanley_seow@rbrnet.com.sg>
>> >Cc: <ccielab@groupstudy.com>
>> >Sent: Tuesday, April 04, 2000 11:12 AM
>> >Subject: Re: OSPF into IGRP
>> >
>> >
>> > > Stanley
>> > >
>> > > Use the ospf "summary address" command on your ASBR to advertise the
>/24s
>> > > that cover the smaller subnets. Then redistribute OSPF into IGRP. It
>is
>> >a
>> > > "hack", but required if you need to use a classful protocol like IGRP
>or
>> > > RIP(1).
>> > >
>> > > E.g.
>> > > (config)#router ospf 1
>> > > (config-router)#ospf summary-address 170.0.1.0 255.255.255.0
>> > > ! covers any smaller (/25 thru /32) subnet in the 170.0.1.0 /24
>space...
>> > >
>> > > Enjoy!!
>> > >
>> > > Henry Steuart
>> > > CCSI# 97174
>> > > henry@resourcenetworks.com
>> > >
>> > > At 11:49 AM 4/5/00, you wrote:
>> > >
>> > > >Hi all,
>> > > >
>> > > >Need some help here..
>> > > >
>> > > >I am trying to redistribute OSPF into IGRP....
>> > > >
>> > > >OSPF have some /24 /29 /30 routes whereas IGRP have only
>> > > >/24 routes....
>> > > >
>> > > >all of them are in 170.100.0.0 networks.
>> > > >
>> > > >What are the command to redistribute all the subnets from OSPF into
>> > > >IGRP..
>> > > >
>> > > >How do I summarize those /29 and /30 routes into /24 routes in OSPF
>??
>> > > >
>> > > >Thanks
>> > > >
>> > > >
>> > > >Stanley
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:23:13 GMT-3