and couldn't be happier. Life is just so much better without running OSPF or EIGRP internally.
That is all.
*edit*
watch this: https://youtu.be/yJbqnOdD3cg
read this: https://www.oreilly.com/library/view/bgp-in-the/9781491983416/
My design is built on eBGP, 32 bit ASNs, modifying timers, specifically the keepalive = 1, hold = 3, advertisement interval = 0, and BFD.
It's possible, thanks to BFD, to get sub-second failover.
*edit 2*
I run eBGP in from my internet edge, throughout my DC, across my WAN, and all the way down to my access switches at branch sites and corporate campuses. I have a single pocket of OSPF across a P2P link to a vendor device that does not support BGP.
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