Re: MP-BGP extended community with OSPF on PE-CE

Hello Jules,

You can have a sham-link across the MPLS superbackbone, and routes seen
through sham-link are intra-area routes.

You can see more details here:
http://www.cisco.com/en/US/docs/ios/iproute_ospf/configuration/guide/iro_sham_link_ps6441_TSD_Products_Configuration_Guide_Chapter.html

Regards,
Rares Donca

On Wed, Jan 19, 2011 at 11:33 PM, jules NYA BAWEU <nyabaweu_at_gmail.com>wrote:

> Hello Guys,
>
> can anyone, please, clarify this for me?
>
> It is related to the MP-BGP extended community "Route-type" used to carry
> OSPF routes across the MPLS core.
>
> Route-type as the following format: "S:T:M" --> with "S" = source area, "T"
> = type of route, and "M" = metric type.
>
> "T" can take the following value:
>
> 2 for intra-area prefixes
> 3 for inter-area prefixes
> 5 for external prefixes
> 7 for NSSA prefixes
>
> My issue is with T = 2; I thought the concept of intra-area is not relevant
> here at all as routes going across the super backbone will enter the VRF on
> the other side as inter-area anyway.
> Why the need of having that option (T = 2) to represent intra area routes
> in
> the community value?
>
> Thanks in advance
>
>
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Received on Wed Jan 19 2011 - 23:45:35 ART