Thursday, November 18, 2021

Trunk vs Access - Latency & Performance

Hello, I am assisting in a science project involving very precise timing (interferometry). I have a VLAN/trunking question regarding impacts on latency vs access ports. I am a computer monkey and know very little about interferometry other than it's dark voodoo magic science that uses lots of lasers and actually requires PNTP instead of NTP. I am not actually certain about the requirements on the latency side (I am operating under the assumption that we want to minimize latency as much as possible), this whole project has been a bit of a scramble actually as we're upgrading lots of equipment in anticipation of more projects.

Here's a simplified diagram of what we are doing: https://i.imgur.com/2yTlA1d.png

The proposed change to the diagram is changing the single trunk link between switch1 and switch2 to 3 access ports instead, similar to how switch1 and switch3 are connected.

Given the 3 links are 1Gig and the trunk is 10Gig, do we see any real impact on latency between 200,201,202A to 200,201,202B by using a trunk vs access port? Would using no vlans at all improve latency? Thanks for the input.



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