RE: MPLS Super Backbone + Default route

Default routes need to be generated to redistributed manually in MPLS super
backbone.

happy labbing

> Date: Fri, 20 Aug 2010 19:48:40 +1000
> Subject: Re: MPLS Super Backbone + Default route
> From: greyburn_at_gmail.com
> To: mirco.orlandi_at_gmail.com
> CC: ccielab_at_groupstudy.com
>
> Hi, Thanks for the replies. Redistribution is working fine (its
> actually BGP to OSPF).
>
> I have a pool of 4 routers on one side and a pool of 4 routers on the
> other side. Super backbone connects them.
>
> All routers on one side can see the OSPF default route (originates
> from PE, learnt via BGP). The routers on the other side cant see the
> default. However they can see other external OSPF routes. So the
> backbone is working.
>
> Ive connected another test router in another area and the default does
> show up (as an IA just like it should through super backbone).
>
> So I've pretty much proven that:
>
> 1. super backbone is working.
> 2. default routes are not carried over super backbone.
>
> So I dont think its so much as a problem, but more likely thats how
> super backbone works. What I want to know: is there a reason for it
> and can it be enabled?
>
> Thanks,
>
> Gordon
> On Fri, Aug 20, 2010 at 7:42 PM, Mirco Orlandi <mirco.orlandi_at_gmail.com>
wrote:
> > Hi Gordon,
> > maybe the issue is on redistribution point at pe:
> > - in order to redistribute external ospf routers in bgp, you have to be
> > explicit;
> > - default-information originate is required inside address-family.
> >
> > pe1#
> > router bgp 1
> > address-family ipv4 vrf vpnA
> > redistribute ospf 1 match external
> > default-information originate
> >
> >
> > pe2#sh ip route vrf vpnA | i 0.0.0.0
> > B* 0.0.0.0/0 [200/1] via ..........
> >
> > HTH,
> > -mirco.
> >
> > On Fri, Aug 20, 2010 at 5:56 AM, Gordon <greyburn_at_gmail.com> wrote:
> >>
> >> Hi Guys,
> >>
> >> If your running super backbone to link two different OSPF routing
> >> instances (same AreaID & Process) it seems as through it will not
> >> carry default routes.
> >>
> >> I have tested this and other external routes (learnt via BGP) work
> >> fine. However the default (also learnt via BGP) is not appearing on
> >> the other side of the MPLS cloud.
> >>
> >> All routers directly connected learn the default through OSPF, just
> >> the routers on the other side of the MPLS cloud don't. Im guessing
> >> this is some sort of restriction in running super backbone, however
> >> there is a real lack of documentation. Any one know the answer to
> >> this?
> >>
> >> Thanks for your help!
> >>
> >> Gordon
> >>
> >>
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Received on Sat Aug 21 2010 - 14:08:34 ART