Friday, April 5, 2019

Cisco SDWAN, Viptela?

Anyone else run into MTU issues when working with 17.x and 802.1q interfaces ?

Long story short, when converted to a trunk, the Vedge only supports a max wire size frame of 1514, resulting in a max mtu of 1496, causing all sorts of fun.

Quick fix is to ensure the core switch transit vlan, that connects to the vedge is set to 1496, and mss adjust is set.

Not usually an issue with tcp flows due to the mss adjust, but when it comes to full frame UDP traffic...... well yeah.



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