From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Wed Aug 01 2007 - 01:56:58 ART
Hi Brian,
If I'm not wrong, "default-information originate" is also required when
redistributing a default route into BGP.
I have additional question: For BGP, can I use the command "network 0.0.0.0mask
0.0.0.0" to advertise the default route instead?
What's the difference between the "redistribute + default-info originate"
method and the "network 0.0.0.0" method? The former will have an origin code
of incomplete (?) and the latter an origin code of IGP (i)?
I guess I have to lab it up to know.
Thank you.
B.Rgds,
Lim TS
On 8/1/07, Jensen, Brian D. <bdjensen@eschelon.com> wrote:
>
> Hi Greg,
>
> In order for the redistributed route to be originated into the ospf
> areas you will need the "default-information originate" command under
> the ospf process on the router doing the redistribution. This will
> generate a default route into ospf as long as the RIP route is valid. If
> you wish to redistribute a route whether or not the RIP route is valid,
> then you will need the "default-information originate always" command
> under the ospf process.
>
> Thanks,
>
> Brian
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Gregory Gombas
> Sent: Tuesday, July 31, 2007 8:29 PM
> To: Group study
> Subject: Re: Can you redistribute a default route from one protocol to
> another?
>
> By the way, I tested this with EIGRP and the RIP default DOES get
> redistributed into EIGRP.
>
> Must be an OSPF thing....
>
> On 7/31/07, Gregory Gombas <ggombas@gmail.com> wrote:
> > Not sure if this falls under the body of common knowledge, but when
> > redistributing from one protocol to another, will the default route
> > get redistributed as well?
> >
> > In this case I am learning a default route via rip.
> > I am redistributing rip into ospf but do not see the default route
> > being redistributed.
> >
> > Rack8SW1#show ip route 0.0.0.0
> > Routing entry for 0.0.0.0/0, supernet
> > Known via "rip", distance 120, metric 4, candidate default path
> > Redistributing via ospf 1, rip Last update from 163.8.57.5 on Vlan57,
>
> > 00:00:14 ago Routing Descriptor Blocks:
> > * 163.8.57.5, from 163.8.57.5, 00:00:14 ago, via Vlan57
> > Route metric is 4, traffic share count is 1
> >
> > Rack8SW1#
> >
> > Rack8SW1#show ip ospf database
> >
> > OSPF Router with ID (150.8.7.7) (Process ID 1)
> >
> > Router Link States (Area 0)
> >
> > Link ID ADV Router Age Seq# Checksum Link
> count
> > 10.3.3.3 10.3.3.3 1002 0x80000009 0x002E8F 3
> > 10.4.4.4 10.4.4.4 94 0x80000010 0x00C933 3
> > 150.8.7.7 150.8.7.7 89 0x8000000B 0x00B5BB 1
> >
> > Net Link States (Area 0)
> >
> > Link ID ADV Router Age Seq# Checksum
> > 163.8.0.4 10.4.4.4 95 0x80000004 0x005FCE
> > 163.8.0.134 10.4.4.4 986 0x80000007 0x008DB4
> >
> > Type-5 AS External Link States
> >
> > Link ID ADV Router Age Seq# Checksum Tag
> > 150.8.7.0 150.8.7.7 91 0x80000006 0x00A3A5 0
> > 163.8.7.0 150.8.7.7 91 0x80000006 0x00F942 0
> > 163.8.57.0 150.8.7.7 91 0x80000006 0x00D138 0
> > Rack8SW1#
> >
> > As you can see, show ip route says its learned via rip and is
> > redistributing via ospf 1, but it does not appear in the OSPF
> > database.
> >
> > If this is common knowledge, can someone please point me to the
> > documentation that says this is not allowed?
> >
> > Thanks,
> > Greg
>
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