Monday, January 27, 2020

Fast Failover in SD-WAN Networks

It’s amazing how quickly you get “must have feature Y or it should not be called X” comments coming from vendor engineers the moment you mention something vaguely-defined like SD-WAN.

Here are just two of the claims I got as a response to “BGP with IP-SLA is SD-WAN” trolling I started on LinkedIn based on this blog post:

Key missing features [of your solution]:

  • real time circuit failover (100ms is not real-time)
  • traffic steering (again, 100ms is not real-time)

Let’s get the facts straight: it seems Cisco IOS evaluates route-map statements using track objects in periodic BGP table scan process, so the failover time is on order of 30 seconds plus however long it takes IP SLA to detect the decreased link quality.

Read more ...
Thanks to Ivan Pepelnjak (see source)

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