Re: Redistribution & Sham-link ISSUE

Hi Experts i'm confused. why is *match internal external 1 external 2 * so
special and the ip reachability does not work without them??

On Fri, Oct 29, 2010 at 7:28 AM, NET HE <he_net_at_hotmail.com> wrote:

> I believe your sham-link is up. The reason you saw those ospf routes is
> that
> all those ospf routes were penetrated to another site through sham-link
> which
> works similiar as virtual-link.
>
> You can verify it through another lab: you don't do redistribution between
> BGP
> and OSPF at PEs. Then configure PEs to make sure the sham-link is up. You
> will
> still see ospf routes from remote site.
>
> One more thing to reminder. For the lab I suggust above, after the
> sham-link
> is up, you save all the configurations, and reload the PE routers. You will
> see the sham-link will not go up untill you do redistribution between BGP
> and
> OSPF.
>
> So while doing MPLS labs, you not only have to check routing tables, but
> also
> have to verify traffic connectivity. That's the phenomenum some books calls
> "MPLS seperates the control plane and data plane".
>
> I hope this helps
>
> Best Regards,
> Net (Xin) He
> CCIE 27004
>
>
>
> > Subject: Re: Redistribution & Sham-link ISSUE
> > From: maniac.smg_at_gmail.com
> > Date: Thu, 28 Oct 2010 07:04:53 +0200
> > CC: ccielab_at_groupstudy.com
> > To: ksanpu_at_gmail.com
> >
> > If you have routing information for those subnets but no reachability
> then
> check that your Mpls is working 100%
> >
> > Check your MPLS forwarding tables and make sure all labels are correct.
> >
> >
> > CCIE # 23962 (SP)
> >
> > Sent from my iPhone 4
> >
> > On 28 Oct 2010, at 4:31 AM, Anbu <ksanpu_at_gmail.com> wrote:
> >
> > > Hi All
> > > I am facing an issue in the OSPF sham-link configuration , my setup is
> two
> > > customer sites connecting to MPLS back bone at the same time have a
> > > connection in between the sites.
> > >
> > > Say I have two sites Site A and Site B.both sites have O , O IA , O E2
> > > routes. when i am redistributing from the OSPF to Address family of
> > > perticular VRF* ( redistribute ospf 1 vrf VPNX match internal external
> 1
> > > external 2)* , it is working perfect.
> > >
> > > But if i didnot include the *match internal external 1 external 2 *in
> the
> > > PE(connecting to Site B) when redistributing , I cannot reach those
> > > External routes from Site A,
> > > but the Site A routers donot remove those Routes from the routing
> table.
> > >
> > > Can anyone help to overcome this issue.
> > >
> > > When i was troubleshooting this ,
> > > Even i remove all the redistribution in the PE routers , all the routes
> are
> > > learning through the sham-link , but readability is not there.
> > >
> > > Regards,
> > > Anbu.
> > >
> > >
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Received on Thu Dec 02 2010 - 12:50:19 ART