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Cisco SD-WAN : Overhead size

Joe Yin
Level 1
Level 1

Hi all,

I recently came across a presentation from Cisco Live 2020 on the Cisco Live OnDemand website (BRKRST-2377) : https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2020/pdf/BRKRST-2377.pdf

While reviewing the material, I noticed a point of interest on slide 42 regarding the ESP size, which was mentioned as 36 Bytes. I wanted to confirm if this is accurate or if it might be a typographical error ?

image (4).png

I'm looking for the correct (or an estimated) overhead (Label+ESP+UDP) size that will be added in Cisco SD-WAN ?

I've also come across information in a Cisco Document (not SD-WAN) (https://www.cisco.com/c/dam/global/en_ca/solutions/strategy/docs/sbaGov_wanDguide.pdf), which indeed mentions the addition of 36 bytes, but specifically for "Transport Mode." However, this doesn't align with the SD-WAN encapsulation type.

image (5).png

Lastly, I conducted a Wireshark capture in an SD-WAN Network (EVE-NG), and although I observed a lower overhead than 36 bytes (something like ~30 bytes including ESP, Label and UDP encapsulation), but I'm not sure due to encryption.

Thank you for your time !

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