How does the DMPO confirm the traffic return path?

Liboyer — Sun, 09 Jul 2023 03:47:33 GMT

I can specify overlay traffic to go out from GE3, but I can't guarantee that it can go back from GE3, what can I do? Or how does Velo's DMPO handle this situation? Is there a reference document on the official website? Thank you very much!

Re: How does the DMPO confirm the traffic return path?

AlexNCR — Mon, 10 Jul 2023 19:15:30 GMT

Hi There,

- If you are really sending the traffic on the "Overlay" (DMPO), it doesn't really matter wich GEx interface with enabled DMPO the traffic is coming back in, it is handled at the "Overlay/DMPO" part of the internal Edge routing.

- Only problem you might face is if you send the traffic out on the Overlay (DMPO), and the return traffic is not coming over the Overlay, but instead comes back on the underlay (BGP, MPLS...).

BTW: while considering the SD-WAN networking, both Underlay (as in the drawing), and the Overlay must be visualized (part that is missing here). And for the Overlay visualization, I would suggest not to have two GEx interfaces, but only one DMPO link drown (that is actually bundling the two interfaces. There are a big number of optimization, link steering, and corrections happening in the background, many of them designed to prevent the asymmetric routing you asked about...

Only reason not to do so (one DMPO link) would be two different type of interfaces (one Direct internet, and other one in MPLS private networking. And some Business policy preventing the link steering for some reason (private web application on the MPLS location).

Hope this help you not to worry too much

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How does the DMPO confirm the traffic return path?

Re: How does the DMPO confirm the traffic return path?