From: Mosley, Arthur (Arthur.Mosley@xxxxxxxx)
Date: Wed Apr 05 2000 - 18:51:31 GMT-3
The biggest problem you might have on a lab when you need a default network
is that you might have to pick a network that is not part of your core
subnetting structure. For example, if all of your address start with
125.100.X.X when you summarize into IGRP your default network will be your
own. So, you need to choose a different classfull address. You may have
some external networks to choose from(195.10.2.x or 136.10.x.x).
Art
-----Original Message-----
From: Ryan B
To: stanley_seow@rbrnet.com.sg; Henry Steuart
Cc: ccielab@groupstudy.com
Sent: 4/5/00 5:07 PM
Subject: Re: OSPF into IGRP
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