|High Availability / FAQs for HA Decisions|
Solution may be to implement a third party ADC, or upgrade the shared network.
One possible solution is to introduce a third party ADC to solve the problem of redundancy between the two data centers. See the Non-Layer 2 Adjacent type deployment section in this page.
Alternatively, the network between the two datacenters could be upgraded to support Ethernet Layer 2 Adjacency by one of several method options as described in How do I span Layer 2 Adjacency across the data centers?.