From: Erick B. (erickbe@xxxxxxxxx)
Date: Fri Oct 05 2001 - 00:37:39 GMT-3
FYI,
This 'workaround' doesn't work in 12.1T and higher
anymore.
With 12.1 mainline and below *any* routes can be
redistributed into OSPF even if they are part of OSPF
already. In 12.1T and higher if that network/mask is
part of OSPF already it won't be redistributed. 12.1T
is correct behavior and earlier versions were
incorrect. I checked with Cisco on this as there were
no docs/release notes mentioning this behavior change.
They are updating the docs.
--- Batman <rschotz@quiknet.com> wrote:
> this is excellent insite - good work around tricks
> for the lab
>
> I think the type 5 lsa & type 2 lsa will cause ospf
> db fluctuations though -
> a similar config caused an isdn ospf demand circuit
> to bounce continuously
> in another lab CCIE bootcamp 8) - this was discussed
> in a previous string in
> this group.
>
> somethin to be aware of at lab time.
>
> ----- Original Message -----
> From: "Michael Snyder" <msnyder@ldd.net>
> To: <ccielab@groupstudy.com>; "kenairs"
> <kenairs@hotmail.com>
> Sent: Thursday, September 20, 2001 9:00 AM
> Subject: Re: OSPF redis conn
>
>
> > Both as a internal route and an external route.
> Thought I think only one
> > will show up in the routing table on the router
> you are on.
> >
> > Do a show ip ospf data, you should see network lsa
> for 192.168.1.0 and
> also
> > a type 5 lsa for it.
> >
> > BTW, this is both a good thing and a bad thing.
> If you need to summarize
> a
> > route, this is a very handy thing to do. To
> summarize any route in OSPF
> you
> > need a type 5 external lsa (seed) on a ASBR. The
> summary command will
> grow
> > the (seed) lsa to any size mask you need.
> >
> > Funny, I didn't think of it before, but you use
> the redistributed
> connected
> > command to plant a seed (external type 5 lsa), and
> the summary command to
> > grow it.
> >
> > Also if you are not allowed to use redistributed
> connected to do this, you
> > can do the same thing with another ospf process.
> On the second ospf
> process
> > just add the one interface you need, then you must
> set the selected
> > interface to passive, then redistribute the second
> ospf process into the
> > first. You'll get the single type 5 lsa you need.
> >
> > Back to your example, the bad thing is you also
> redistributed ALL
> connected
> > interfaces into OSPF. That's a lot of ghost
> (extra) lsa 5's introduced
> into
> > the routing process. Don't do this in the LAB!
> >
> > Much better to use a route map to choose which
> connected interfaces to
> > insert as LSA 5's.
> >
> > The Below route map was posted by
> SFeldberg@edeltacom.com earlier this
> week.
> > Very handy.
> >
> > ------------cut----------------
> >
> > interface Loopback0
> > ip address 152.1.11.1 255.255.255.240
> > no ip directed-broadcast
> > !
> > router ospf 1
> > redistribute connected subnets route-map Loop0
> > !
> > route-map Loop0 permit 10
> > match interface Loopback0
> >
> > ------------cut----------------
> >
> > ----- Original Message -----
> > From: "kenairs" <kenairs@hotmail.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Thursday, September 20, 2001 9:54 AM
> > Subject: OSPF redis conn
> >
> >
> > > Hi ,
> > > I have a router running ospf . i wanted a
> specific route to appear as
> > External
> > > . Below is my partial config.
> > >
> > > interface ethernet 0
> > > ip add 192.168.1.1 255.255.255.0
> > >
> > > router ospf
> > > network 192.168.1.0 0.0.0.255 area 1
> > > redistributed connected subnets metric 10
> > >
> > > How will the 192.168.1.1 being advertied ?
> > > As inter area route or external route
> redistributed into OSPF ?
> > >
> > > tks
> > > **Please
> read:http://www.groupstudy.com/list/posting.html
> > **Please
> read:http://www.groupstudy.com/list/posting.html
> **Please
> read:http://www.groupstudy.com/list/posting.html
>
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