[yusyusyus]

I appreciate this comment. In my world of packet pushing, I try to promote vendor diversity for this reason.

The practical downsides of this diversity live in the complexity of the interop (often slowing feature velocity), operations, and procurement/support.

But issues like the AT&T 4ESS outage have occurred before in IP networks, as an example, in some BGP bug. Diversity alleviates some of the global impact.