Hi all, We have active passive setup of firewalls in both DC and DR site. The scenario I am trying to work on is, if my downstream connected core switches are down in primary DC, how can make ISP and MPLS connected devices on my upstream learn that all traffic should be routed to DR site firewalls. Basically, How can we make ISP and MPLS router learn that both core switches are down eventhough the firewalls are UP.?
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