Re: Sham links between different ospf areas

Well, think about it. If you have CEs in different areas, the only way
to connect them using backdoor link is for that link to be in area 0
... or to build virtual link... or to have on at least one of them
Loopback/some other interface in area 0.

Since you can't build sham-link between different areas, logically,
sham-link would need to be in area 0. Now, that brings up the issue of
partitioned area 0 (and few other things) and that needs some fixing.

We cover MPLS VPNs very deeply in our training classes and material.
Get in touch with me offlist to hook you up with our Training
Advisors.

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On Sat, May 15, 2010 at 09:08, Praveen chiguru
<chiguru.praveen_at_gmail.com> wrote:
> Hi Hussam,
>
> Virtual link is not required here. In this scenario, It can carry as
> LSA 3 type....However, you can influence sham-link over backup link
> using cost B parameter. I believe, it does work smooth.
>
> Experts, Pls comment if I am wrong.
>
> Regards,
> Praveen.
>
>
>
>
> On Fri, May 14, 2010 at 10:10 PM, Hussam EL Kebbi
> <hussamkibbi_at_hotmail.com> wrote:
>> Hi Experts,
>> I was wondering if we have Sham links (MPLSVPN) between PEs while CEs have
>> different(non-area0) OSPF areas,say area 1 and area 2. Which LSA type 1 will
>> be distributed between PEs and will we have discontinues OSPFareas, so we need
>> to do virtual links or so? please explain.
>>
>> Thanks,
>>
>>
>>
>>
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