From: Jonathan V Hays (jhays@jtan.com)
Date: Wed Nov 19 2003 - 10:10:05 GMT-3
IMHO, the problem is more a misinterpretation of Doyle.
In the original quote Doyle does *not* say that redistribution is
automatic. Since this is the chapter on default routes and
redistribution is covered in the *next* chapter, it is clear that he is
merely saying that once a default route exists in the RIP routing table,
it will be automatically forwarded to other RIP routers. The same
applies to IGRP and EIGRP, although both IGRP and EIGRP will require the
"ip default-network" command (see p.756-757). Again, I think Doyle is
only saying that once the default route exists in the routing table, you
don't need an extra command such as "default information-originate" to
propagate is to other routers running the same routing protocol. I think
this is pretty close to the mark.
How to redistribute default routes and connected routes does vary among
routing protocols and even IOS version. But again, redistribution was
not the topic of that chapter or nor is it the topic of the cited
paragraph.
Doyle's chapter on redistribution (Chapter 13, "Route Filtering") is
still an excellent starting point and I did not notice any mistakes the
last time I reread it. If you find one, please post it.
Jonathan
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
>Behalf Of Bola Adegbonmire
>Sent: Wednesday, November 19, 2003 4:57 AM
>To: Karim AbdelMonem; WayneLl@lynxtec.com; ccielab@groupstudy.com
>Subject: RE: Default-route generation??
>
>
>Hi,
>
>Karim might have been been right about what he noticed
>happenning about RIP auto distribution of default routes just
>as well as Doyle is right.
>
>The Doyle v1 is a bit old and there have since been
>enhancements or changes to some behaviours. In some cases from
>12.0T and newer IOS versions the behaviour can and should be
>as Karim described. Though it seems like the behaviour may not
>be exactly consistent. Which is why I reckon we are seeing the
>differences. See link below.
>
>http://www.cisco.com/en/US/tech/tk365/tk554/technologies_tech_n
>ote09186a0080094374.shtml
>
>
>
>Karim AbdelMonem <karim_ccie@hotmail.com> wrote:
>Thanks Wayne,
>
>I beleive when using default-network or default route 0.0.0.0
>0.0.0.0 with
>ospf running on the router, this will need default-information
>originate
>under the ospf process to advertise the default to the ospf neighbors.
>
>Regards,
>Karim.
>
>
>>From: "Lloyd, Wayne"
>>To: 'Karim AbdelMonem' , ccielab@groupstudy.com
>>Subject: RE: Default-route generation??
>>Date: Tue, 18 Nov 2003 23:02:24 -0000
>>
>>Following on, I just tested this and I found that my default route was
>>automatically re-distributed through RIP as long as I used the
>>default-network command, the static route to 0.0.0.0 0.0.0.0
>did not work
>>without manual re-dis. Not had chance to test this with OSPF yet.
>>
>>Wayne Lloyd
>>
>>Professional Services Group
>>
>>Lynx Technology Limited
>>
>>Head Office: 01246 574 000
>>
>>Email: waynell@lynxtec.com
>>
>>Web: www.lynxtec.com
>>
>>
>>-----Original Message-----
>>From: Karim AbdelMonem [mailto:karim_ccie@hotmail.com]
>>Sent: 18 November 2003 19:58
>>To: ccielab@groupstudy.com
>>Subject: Default-route generation??
>>
>>Hi Group,
>>
>>As per Jeff Doyle: "after a default route is identified in the routing
>>table, RIP, IGRP and EIGRP will automatically advertise it.
>OSPF and ISIS
>>require some additional config."
>>Trying this on real routers didn't work, configuring a
>default route, RIP
>>didn't advertise the default route to other routrers in the
>RIP domain.
>>didn't work until the deafult is redistributed into RIP, Any
>opinions??
>>
>>Also would like to ask about "ip default network" command, is
>it working
>>with RIP, IGRP and EIGRP only or can be used with ospf???
>>
>>
>>Any opinion is highly appreciated,
>>Karim.
>>
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