Backdoors for redundancy

Hi All,

I need help for the on of the scenario in backdoors.

Please refer to the Diagram in the below link.

1) there are 4 sites namely 1,2,3,4
2) site1,2,3 are connected to MPLS Cloud and have Full Mesh L3VPNs using vrf
SP
3) All PE-CE routing protocols are EBGP, AS Override
4) Site 4 has to be cascaded behind site 1 as per requirement, hence we can
say that Site 4 and Site 1 are logically 1 single site w.r.t MPLS Cloud.
5) There is a link between Site 3 CE 2 and Site 4 Dist 1 router, which in
this case becomes a backdoor between 2 sites

*Requirment *:

1) We have to keep the backdoor link between 2 routers which is running
EIGRP to provide Backup Path in case both link between Site1 CE1,2 and Site4
Core1 and 2 goes down so that Site 4 does not goes down in case of dual link
failure.
2) Backdoor should never be used as primary Path even communication between
Site 3 and 4 should be via Site 1 if links between site 1 and 4 are up.

https://picasaweb.google.com/117764460452023837245/Apr262011?authkey=Gv1sRgCP3sh-Sg1Mee7wE&feat=email#5599920031982032354

Rgds

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Received on Tue Apr 26 2011 - 19:02:17 ART