OSPF PE-CE

[zikalamc]

Hi,

Can someone please clarify for me the role played by OSPF in the backbone when ew are using OSPF between PE and CE. How is this different to when we're using a differenr PE-CE routing protocol?

A route with the "down bit" set, is it dropped by MP-BGP or by the bacbone OSPF?

Thanks

[Harold Ritter]

The OSPF instance used by the backbone and the one used for the VRF are different and there is no interaction between the two.

Hope this helps,

[zikalamc]

Thank you,

But does this mean that there's no requirement whatsoever to run OSPF in the backbone when using PE-CE OSPF (ISIS can be used). I was made to believe that this is a requirement.

[Harold Ritter]

Correct. You could run OSPF between the PE and CE and ISIS (or any other rp in the core).

Hope this helps,

[routingboy]

a route with the "down bit" set, will be dropped by the "vrf OSPF" of the PE