From: Erick B. (erickbe@xxxxxxxxx)
Date: Fri Aug 31 2001 - 12:17:00 GMT-3
What version of code? Starting with 12.1T you can't
redistribute a directly connected network into OSPF if
it is part of OSPF already. I posted a summary of the
redistribution differences between 12.1 mainline and
below and 12.1T above last week. I also contacted the
TAC on this since it looked like a bug perhaps but
they are telling me that 12.1T handle this correctly
and 12.1 mainline and below don't. This does make
sense since in the real-world there isn't a reason why
you need a network native to OSPF and also learned
externally.
Using the scenario below, if it was 12.1T and above
and the /28 was a directly connected interface/network
part of OSPF and IGRP then when you try to
redistribute into OSPF the /28 won't be put into OSPF.
If you do a 'debug ip ospf lsa-gen' and clear the
redist it will say max-aged when trying to put this
into OSPF.
--- Paul Crist <pcrist@netsync.net> wrote:
> My understanding of the summary address is that it
> should be used when
> redistributing other routing protocols into OSPF.
> The summary address
> command creates a route to null0, that is why you
> get the high metric. The
> correct way to do what you what is to do is to do an
> area range. Sometimes
> that does not work due to virtual links that you
> have running. My thought
> would be that if you are asked a question like that
> you need to configure
> the IOS as you would normally, if you have a problem
> ask the proctor if you
> can use an alternate configuration. Be aware of the
> problems your alternate
> configuration will cause; routes to null0, flapping
> routes, redistribution
> problems, etc. You may want to take a look at the
> initial problem -
> redistribution into FLSM protocol and see if there
> is a different approach
> you can use.
>
> Paul Crist
> ----- Original Message -----
> From: "CCIE yong" <ccie_yong@hotmail.com>
> To: <ccielab@groupstudy.com>
> Sent: Friday, August 31, 2001 6:24 AM
> Subject: summary-address
>
>
> > Hi,
> >
> > I have question regarding the summary-address
> creation for the fatkid lab
> > 501 that make the /28 at area 0 to /24, so that
> the igrp router can get
> the
> > route.
> >
> > the question is, the creation of "summary-address"
> is it IOS version
> > specific, meaning that does it mean that some ios
> version can do the job
> > while some can't, because I tried to create the
> summary-address for area 0
> > (/28) at r3 of fatkid lab 501, I CANNOT see the
> "170.10.7.0 255.255.255.0
> is
> > a summary" in the routing table, and when I did
> >
> > r3#sh ip os s
> >
> > OSPF Process 1, Summary-address
> >
> > 170.10.7.0/255.255.255.0 Metric 16777215, Type 0,
> Tag 0
> >
> > seems like the metric is very big, actually I
> don't know what it means,
> and
> > just can't go to the routing table.
> >
> > please advise.
> >
> > Thanks in advance
> > Yonger
> >
> >
> >
>
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