From: Ryan B (rbenigno@xxxxxxxx)
Date: Thu Apr 06 2000 - 13:27:34 GMT-3
Ya, we went over that a few messages ago =) The example was about
summarizing VLSM routes from the same classful network into IGRP... From
what a few little birdies have told me, there may be a time in our lives
where we may be told specifically not to use the summary-address command.
While we *could* use it and "redistribute connected subnets" or whatever, I
want to make sure I know every other way to get this stuff done.
Gotta love "Do task A, but don't use X, Y or Z to get it done"...
-Ryan
----- Original Message -----
From: "Joel W. Ekis" <jekis@cisco.com>
To: "Ryan B" <rbenigno@home.com>
Cc: <ccielab@groupstudy.com>
Sent: Thursday, April 06, 2000 4:53 AM
Subject: Re: OSPF into IGRP
> Ryan:
>
> A couple of issues on what you are trying.
>
> For default-network to function you need to choose a Classful network that
is not in use in the IGRP domain. You are trying to use 10.128.0.0 which is
a portion of the Class A network 10.0.0.0. This is already assigned to your
IGRP domain. 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 network, 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 space.
>
> 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