From: Sandro Ciffali (sandyccie@xxxxxxxxx)
Date: Mon May 21 2001 - 22:05:03 GMT-3
Here are my two cents on the topic classless to
classful redistribution.
I am assuming the ASBR running ospf and igrp has same
major network and subnets /24 for igrp and /28 for
ospf, Ospf backbone is area 0 with a multipoint
network to the other two and point to point to router
running igrp
So when you configure IGRP on this ASBR, the OSPF
interface (/28) is also running igrp in passive mode.
Now on this router when you say summary address
x.x.x.x mask It assumes you are summarizing IGRP
routes being redistributed into OSPF, The summary
addresses works fine this way, If you check routing
tables of the other ospf spokes you would see this
summary route as E2 route (they would have /28 as
attached and /24 as E2 summary). Then OSPF
redistributes this route back in IGRP fine. This is
kind of confusing, Since summary address is generated
from redistributed route from igrp and then this
summary address is redistributed back in igrp, but it
works fine. This works only for ASBR for no other ospf
router. Atleast i don't know any simpler way than
this. For router other than asbr the best way is to
redistribute connected or someway of brining these
routes external and summarize them.
Thanks
Sandro
----- Original Message -----
From: "garry baker" <fallow46@yahoo.com>
To: "David Anderson" <dma@cisco.com>; "Roman Rodichev"
<rodic000@hotmail.com>
Cc: <ccielab@groupstudy.com>
Sent: Sunday, May 20, 2001 11:31 PM
Subject: RE: another redistribution question
> David,
>
> you could try a second ospf process and redistribute
> your main process into your second and then use the
> summary-address command and redistribute the second
> process into igrp. i did something like this
recently
> but i had to redistribute both ospf processes to get
> all my /24 routes into igrp, not too sure why i had
to
> do that, does anyone have any ideas?
>
> Garry
> --- David Anderson <dma@cisco.com> wrote:
> > Roman,
> > I tried the area 0 range on one of the routers
that
> > was one hop away from
> > the ASBR. However the ASBR is also part of area 0
> > and I cant seem to get
> > the summary route to show up in the ASBR or any of
> > the routers. Any
> > ideas? I am going to try again and just see if I
> > missed something.
> > Thanks,
> > David
> > At 09:45 PM 5/20/2001 -0500, Roman Rodichev wrote:
> >
> > >Where did you see that command?! I don't think it
> > exists. :) Summarization
> > >doesn't make any sense under IGRP. It is
classful.
> > >
> > >ip summary-address can only be done for EIGRP and
> > RIPv2
> > >
> > >roman
> > >
> > >
> > >>From: "Gregory W. Posey Jr."
<gposey@conects.com>
> > >>Reply-To: "Gregory W. Posey Jr."
> > <gposey@conects.com>
> > >>To: "David Anderson" <dma@cisco.com>,
> > <ccielab@groupstudy.com>
> > >>Subject: RE: another redistribution question
> > >>Date: Sun, 20 May 2001 22:17:39 -0400
> > >>
> > >>I believe you use the "summary-address" command
> > when summarizing between
> > >>OSPF and another routing protocol.
> > >>
> > >>The "area range" command is for when you
summarize
> > from one area to the next
> > >>(on an ABR) within OSPF.
> > >>
> > >>To summarize from one protocol (e.g. EIGRP) into
> > OSPF, use the
> > >>"summary-address" command under the OSPF
> > "config-router" mode.
> > >>
> > >>For your situation (summarizing from OSPF into
> > another routing protocol), if
> > >>IGRP acts the same as EIGRP, then you configure
it
> > under the interface
> > >>"config-if" mode, and the command is...
> > >>
> > >>"ip summary-address igrp 101 X.X.X.X Y.Y.Y.Y"
> > >>
> > >>Of course either/both command(s) is/are
configured
> > on the router that runs
> > >>both OSPF and IGRP.
> > >>
> > >>
> > >>Thank you,
> > >>Greg Posey Jr.
> > >>CONECTS Network Analyst
> > >>CCNP - Security Specialist
> > >>Cisco Voice Access Specialist
> > >>
> > >>-----Original Message-----
> > >>From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com]On Behalf Of
> > >>David Anderson
> > >>Sent: Sunday, May 20, 2001 9:24 PM
> > >>To: ccielab@groupstudy.com
> > >>Subject: another redistribution question
> > >>
> > >>
> > >>Ok, here is my redistribution question:
> > >>
> > >>Suppose I have an OSPF area (say area 0) with a
> > /28 mask and I am
> > >>redistributing with IGRP which has a /24 mask.
> > Can one summarize the area
> > >>0 using the area range command on the ASBR? I
> > tried and could not get it
> > >>to work. However, what I did get to work was to
> > create a loopback on
> > >>another router in my ospf domain using the same
> > subnet I have in my area 0,
> > >>but with a /24 mask and then advertised that
into
> > ospf and all was well on
> > >>the IGRP router. I could ping all of my /28
ospf
> > interfaces. Does anyone
> > >>have any suggestions other than this? Did I
miss
> > anything?
> > >>
> > >>Thanks everyone,
> > >>David
> > >>David Anderson
> > >>Network Design Engineer
> > >>Enterprise Solutions Architecture & Design
> > >>(408) 853-5515
> > >>dma@cisco.com
> > >> | |
> > >> ..:|||||||:...:|||||||:..
> > >>C I S C O S Y S T E M S
> > >>**Please
> > read:http://www.groupstudy.com/list/posting.html
> > >>**Please
> > read:http://www.groupstudy.com/list/posting.html
> >
>
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