From: NET HE (he_net@hotmail.com)
Date: Sun Feb 22 2009 - 14:21:28 ARST
Have you tried using interface command to pick up interfaces into ospf process
instead of using ospf process command "network"?
Best Regards,
Net (Xin) He
> Date: Sun, 22 Feb 2009 00:08:02 -0500
> Subject: Re: Recursive Routing and Tunnels
> From: all.from.nj@gmail.com
> To: madsen.jason@gmail.com
> CC: mcnever@gmail.com; ccielab@groupstudy.com
>
> Yep, you are right, will do; thanks.
>
> Any additional comments on the recursive routing ... agree with the method
> of 'solving' it?
>
> Many TIA,
>
> Andrew
>
>
> On Sun, Feb 22, 2009 at 12:05 AM, Jason Madsen
<madsen.jason@gmail.com>wrote:
>
> > no, the command is distribute list out...not data-base filter. you can do
> > it on ASBRs for external routes. try it out.
> >
> > Jason
> >
> > On Sat, Feb 21, 2009 at 10:03 PM, ALL From_NJ
<all.from.nj@gmail.com>wrote:
> >
> >> Yeah ... I seem to remember something about this distribute list rule
...
> >> Thanks for mentioning this.
> >>
> >> The command:
> >> ip ospf database-filter all out
> >>
> >> This command filters the LSA outgoing, but ... it is not a distribute
> >> list.
> >>
> >>
> >>
> >>
> >> On Sun, Feb 22, 2009 at 12:00 AM, Jason Madsen
<madsen.jason@gmail.com>wrote:
> >>
> >>> you can do them outbound if you're an ASBR.
> >>>
> >>> Jason
> >>>
> >>> On Sat, Feb 21, 2009 at 9:56 PM, Jason Morris <mcnever@gmail.com>wrote:
> >>>
> >>>> something to keep in mind about how ospf distribute lists work
> >>>>
> >>>> you can never do a distribute list OUT with OSPF.
> >>>>
> >>>> OSPF filters LSAs from the ospf database to the routing table vs
> >>>> filtering
> >>>> routes advertised or recieced from a neightbor like eigrp or rip does.
> >>>>
> >>>> all the databases in an area have to have the same info or ospf can't
> >>>> calculate paths correctly.
> >>>>
> >>>> if that makes since.
> >>>>
> >>>> jason
> >>>>
> >>>>
> >>>>
> >>>> On Sat, Feb 21, 2009 at 11:35 PM, ALL From_NJ <all.from.nj@gmail.com>
> >>>> wrote:
> >>>>
> >>>> > Interesting lab testing tonight, was playing w/ tunnel interfaces
and
> >>>> OSPF.
> >>>> >
> >>>> >
> >>>> > I had a scenario I was practicing, basically it was:
> >>>> >
> >>>> > NBMA w/ network type of non-broadcast. Can not use neighbor command
> >>>> or
> >>>> > make
> >>>> > any config changes to the physical interface on either sides.
> >>>> >
> >>>> > So I created a tunnel and added it to OSPF.
> >>>> >
> >>>> > As you would expect, recursive routing began to occur.
> >>>> >
> >>>> > Here is a nifty debug output which quickly showed why the neighbor
> >>>> bounces:
> >>>> >
> >>>> > R2#debu ip ospf adj
> >>>> > OSPF adjacency events debugging is on
> >>>> >
> >>>> > *Mar 1 04:34:36.531: %TUN-5-RECURDOWN: Tunnel1 temporarily disabled
> >>>> due to
> >>>> > recursive routing
> >>>> > *Mar 1 04:34:37.531: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> >>>> > Tunnel1, changed state to down
> >>>> > *Mar 1 04:34:37.531: OSPF: Interface Tunnel1 going Down
> >>>> >
> >>>> > I know one answer to solve this is to simply remove the physical
> >>>> link's
> >>>> > network address from OSPF. Odd learning though, as I tried to
> >>>> configure
> >>>> > other method of filters.
> >>>> >
> >>>> > OSPF would not take a distribute list OUT for the tunnel interface
...
> >>>> > figured I would simply keep the local physical link's network from
> >>>> being
> >>>> > advertised out via the tunnel. No-go on this.
> >>>> >
> >>>> > OSPF did take a Distribute list IN via the tunnel. I denied the
local
> >>>> > link's network ... and all was well in la-la land (where I live).
> >>>> >
> >>>> > R1(config-router)#distribute-list 12 in tunnel 1
> >>>> >
> >>>> > Would have been easier and quicker for me to simply remove the
> >>>> physical
> >>>> > link's network from OSPF, but I was / am learning ...
> >>>> >
> >>>> > Also, ... I actually prefer a distribute list IN, since if I am able
> >>>> to
> >>>> > keep
> >>>> > the physical link's network in OSPF on my hub router, other peers
will
> >>>> > still
> >>>> > learn about it. I am only filtering via these two routers, and all
> >>>> other
> >>>> > routers still learn about the local link's network.
> >>>> >
> >>>> > Question for the group:
> >>>> >
> >>>> > For recursive learning, any additional thoughts on ways for me to
> >>>> learn
> >>>> > this
> >>>> > / explore this / solve this?
> >>>> >
> >>>> > I suppose in all of life, the kiss method is the best ... Just
> >>>> figured I
> >>>> > would ping yall to see what insights I might learn.
> >>>> >
> >>>> > Many TIA,
> >>>> >
> >>>> > Andrew Lee Lissitz
> >>>> >
> >>>> > --
> >>>> > Andrew Lee Lissitz
> >>>> > all.from.nj@gmail.com
> >>>> >
> >>>> >
> >>>> > Blogs and organic groups at http://www.ccie.net
> >>>> >
> >>>> >
> >>>>
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