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Using track and IP SLA

I am trying to configure a setup where I would advertise a route from router R1, only if I do not see it adversised by Router R2. Is there a way to use track or IP SLA for a reverse conddition? Here's teh scenario:

I have two routers R1 and R2. The could both see 10.10.10.0/23 but I want to prefer to atract 10.10.10.0/24 via R1 and 10.10.11.0/24 via R2. Also, if R1 goes away I then want to R2 to also atract 10.10.10.0/24 and viceversa. To make matters more interesting, I will be doing NAT out of R1 and R2 but I can leave with having to recreate NAT translations.

I could easily do this BGP but I want to, hopefully, keep it simpler and use a combination of track, ip sla and ospf.

Any pointers?

Thx,

José.

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