From: Mariano O'Kon (mariano@xxxxxxxxx)
Date: Sun May 19 2002 - 13:35:48 GMT-3
I've been checking http://www.cisco.com/warp/public/105/52.html#subfirstone
and it seems that the way to do it is to create a static route "ip route
135.1.20.0 255.255.255.0 null0" and redistribute static routes into IGRP.
I've been looking into the FatKid lab to check if we could, or could not,
use static routes and I couldn't find any restrictions on it.
My $0.02
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Ludwig A. Morales
Sent: Sunday, May 19, 2002 10:34 AM
To: ccielab@groupstudy.com
Cc: David Luu
Subject: Re: FATKID 502 Expert Redistribution
Unless all my router has bugs on the IOS the summary address command *DOES
NOTHING* to summarize outgoing advertisements, if any one have a working
config with these pleases post it to prove-test this.
Now, how would I use a second ospf process? do I create a second process
and redistribute my original ospf, use summary address here and redistribute
this one to igrp, or do I run the network I want to summarize in a second
process, summarize it under my original process. please post an example if
anyone have it.
Regards,
Ludwig----- Original Message -----
From: "David Luu" <wicked01@ix.netcom.com>
To: "Jonathan Hays" <jhays@jtan.com>; <ccielab@groupstudy.com>
Sent: Sunday, May 19, 2002 3:50 AM
Subject: RE: FATKID 502 Expert Redistribution
> i did some testing out of curiosity, and the summary-address will be
> advertised out of ospf with or without the 2nd ospf process...so i retract
> the statement below...however i couldnt get it to ping across, buts its
> probably some human error on my end...i will do some more testing to get
> the ping to work...
>
> learning something new everyday
>
> At 11:51 PM 5/18/2002 -0700, David Luu wrote:
> >summary-address summarizes going into ospf, not out
> >
> >if you looked at his config, the 135.1.20.0/22 subnet originated in ospf,
> >so the summary-address would not be advertised to igrp
> >
> >since R4 is an ASBR, you need to summarize to a /24 by creating a second
> >ospf process and redistributing it into and using the summary-address
> >command on the first process
> >
> >
> >At 11:13 PM 5/18/2002 -0700, Jonathan Hays wrote:
> >>Yes - I know what you are thinking - this:
> >>
> >>http://www.cisco.com/warp/public/104/3.html#12.0
> >>
> >>"External Route Summarization
> >>
> >>External route summarization is specific to external routes that are
> >>injected into OSPF via redistribution. Also, make sure that external
> >>ranges that are being summarized are contiguous. Summarization
> >>overlapping ranges from two different routers could cause packets to be
> >>sent to the wrong destination. Summarization is done via the following
> >>router ospf subcommand:
> >>
> >> summary-address ip-address mask
> >>
> >>This command is effective only on ASBRs doing redistribution into OSPF."
> >>---
> >>The above CCO verbiage WOULD seem to indicate that the command is
> >>effective only one way. However, don't forget, this is an ASBR which
> >>also has the duty to tell external networks about what routes are
> >>available in the OSPF cloud.
> >>
> >>The configuration you gave is only the part where IGRP is redistributed
> >>into OSPF:
> >>
> >>router ospf 100
> >> router-id 4.4.4.4
> >> log-adjacency-changes
> >> summary-address 135.1.20.0 255.255.255.0
> >> redistribute igrp 100 subnets
> >>
> >>I haven't seen the write-up in question, but you are correct that the
> >>above configuration by itself does nothing to redistribute routes into
> >>IGRP. To do that statements like the ones below are needed:
> >>
> >>router igrp
> >> redistribute ospf 100 metric 10000 2000 255 1 1500 subnets
> >>
> >>And the trick here, is that since the 135.1.20.0/22 network has been
> >>summarized in OSPF as a /24, then *that* /24 is what gets redistributed
> >>into IGRP. This "trick" is necessary because IGRP won't understand the
> >>classless subnets. Essentially, you are using the OSPF ASBR's summary
> >>network statement to "adjust" the mask of OSPF classless networks to
> >>something that IGRP will understand.
> >>
> >>HTH,
> >>
> >>Jonathan
> >>
> >>
> >>-----Original Message-----
> >>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> >>Todd Spencer
> >>Sent: Saturday, May 18, 2002 4:54 PM
> >>To: ccielab@groupstudy.com
> >>Subject: FATKID 502 Expert Redistribution
> >>
> >>
> >>I am trying to do the FatKid 502 Expert Redistribution
> >>Lab, and I don't understand the solution provided. I
> >>will try to briefly explain.
> >>
> >>The problem has to do with the classic VLSM to FLSM
> >>problem (IGRP/OSPF). The lab requires that OSPF area
> >>4 be configured with a /22 subnet, and the IGRP domain
> >>be configured with a /24. OSPF area 4 is using the
> >>following subnet 135.1.20.x/22 and the IGRP domain is
> >>using 135.1.1.x/24. The OSPF configuration below is
> >>taken from the solution:
> >>
> >>router ospf 1
> >> summary-address 135.1.20.0 255.255.255.0
> >> redistribute igrp 1 subnets
> >> network 135.1.14.0 0.0.0.255 area 4
> >> network 135.1.20.0 0.0.3.255 area 4
> >>
> >>I am unsure what the summary-address command is doing
> >>in this configuration. How is it able to summarize a
> >>/22 into a /24? How is the /22 subnet getting into
> >>the IGRP domain? If anyone has done this lab and can
> >>provide assistance, it would be greatly appreciated.
> >>
> >>-Todd
> >>
> >>
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