RE: Redistribution & Sham-link ISSUE

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 Oct 28 2010 - 19:28:07 ART