Re: MPLS and OSPF Area 0 Hierarchy

Hi Syed.

Have a look at OSPF sham-links or MPLS superbackbone, either by googling
or in books recommended for SP-track. There is a good chapter about that
in "MPLS Configurations for Cisco IOS Software" one.

In a nutshell without sham-links intra-area LSAs from customer's area 0
would become visible as inter-area ones on the other side because of
redistribution via MP-BGP. To avoid that a sham-link might be used. That
link would pass an intra-area LSAs between two PE routers in on-demand
manner.

HTH
A.

On 2010-02-05 16:53, Syed Khalid Ali wrote:
> Group:
> I need clarification on how area 0 is maintained across MPLS networks between customer network. Some of the example I am going through right now are something like this:
> CE1(OSPF A1)--(PE1)--P1---P2--CE2(OSPF A2)
>
> OSPF (in area 0) is running on SP network (only). Now in a typical DMVPN environment, Area 0 is maintained across the WAN for each site of the customer.Area_1--site_1---Area_0---site_2--Area_2.
> How does it related to this Area 0 concepts?
>
> ThanksKhalid
>
>
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Received on Fri Feb 05 2010 - 17:15:33 ART