Re: MPLS and OSPF Area 0 Hierarchy

Guys, what about this scenario:

Lo0 Lo0
 | |
PE---------eigrp---------PE
 | |
 | |
Ar1 Ar2
 | |
CE1 CE2
 | |
Ar0 Ar2
 | |
 | |
RT1---------Ar2----- ----RT2
| |
 \--------backdoor---------

CE1 - PE running OSPF in vrf VPN-A
CE2 - PE running OSPF in vrf VPN-A

Loopback interfaces of PE routers are in EIGRP domain and MPLS is
using them as transport addresses.

Provider has EIGRP in his core network. Not one PE router has
connection to Area 0. How to solve that problem so that VPN sites can
exchange OSPF routes. After that, it is neccesary to make sure that
customer traffic goes through the MPLS clooud, not backdoor link.
My problem is how to solve problem with non-area0 connecting to PE
routers and how tu use sham-link after that. No static routes allowed
:)

Regards

On Tue, Feb 9, 2010 at 8:07 AM, Roman Rodichev <romangs_at_iementor.com> wrote:
> Couple other interesting scenarios to consider:
>
> PE - area1 - CE - area0
> Area 0 routes will not appear on PE, because CE, ABR, will set down-bit on
> the IA Type 3 OSPF routes and PE will reject them because of loop prevention
> check. You can configure "capability vrf-lite" on the PE to disable loop
> prevention check. You will then see those routes on the PE. Keep in mind
> that some of the routes will become external.
>
> PE - area1 - CE1
> \_ area2 - CE2
> CE1 will not see CE2 routes because you are missing OSPF Area 0. The
> solution is to create a VRF loopback on PE and put it into area0.
>
>
> Regards,
>
> Roman Rodichev
> 6xCCIE #7927 (R&S, Security, Voice, Storage, Service Provider, Wireless)
> Instructor, Content Developer
> ieMentor Corporation http://www.iementor.com
> Y!M: roman7927
>
>
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Muhammad Anser Khan
> Sent: Monday, February 08, 2010 7:51 AM
> To: Syed Khalid Ali
> Cc: Cisco Group
> Subject: Re: MPLS and OSPF Area 0 Hierarchy
>
> Dear Syed,
>
> I dont think so that two different areas will communicate through MPLS
> SuperBackbone Area 0. This Superbackbone Area has different meaning compared
> to DMVPN.
>
> Following are the scenarios are possible from CE :
>
> Area 0 to Area 0
> Area 0 to Area 1
> Area 1 to Area 1
>
> Sham links usually used when we have backdoor links for the same area.
>
> This MPLS SuperBackbone Area 0 used for "Internal OSPF Routes Across MPLS
> VPN Backbone" with the help of BGP Extended Communities for OSPF.
>
> Regards,
> Anser
>
> On Fri, Feb 5, 2010 at 6:53 PM, Syed Khalid Ali
> <khalid_khursheed_at_hotmail.com> 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 Tue Mar 23 2010 - 16:15:04 ART