One of my readers sent me a great question:
I agree with you that L2 DCI is like driving without a seat belt. But is L3 DCI safer in case of DCI link failure? Let's say you have your own AS and PI addresses in use. Your AS spans multiple sites and there are external BGP peers on each site. What happens if the L3 DCI breaks? How will that impact your services?
Simple answer: while L3 DCI is orders of magnitude safer than L2 DCI, it will eventually fail, and you have to plan for that.
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