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Packet loss after FTTP upgrade

Finkfan77 — Tue, 26 Sep 2023 14:32:49 GMT

I have recently upgraded to 500Mb down, 70Mb up FTTP. My previous connection was 80Mb down, 20Mb up. I was expecting to find the new service would fault free, however that’s not the case. Since install I’m losing packets continually. Sky Q box complaints of connection issues. Videos on devices stop and start. My sons PS5 complains of weak connection, despite being hard wired.
I disconnected my home network and tried plugging directly into the smart hub. Rock solid stable connection. No packet losses. I then started plugging switches back in, and this started my issues again. Of the 5 switches I have in various locations around the home, 2 new switches work fine, I have just replaced another switch, which is only a year old, if that. This one was dropping packets when tested. These 3 appear to be behaving normally. I have another 2 switches which, when I connect back up to the network, have this losing packets issue constantly. Is this just an issue that is more noticeable with a faster connection? Or have 3 switches all coincidentally begin to fail at the same time?
With my previous 80/20 wire connection there were no packet losses when connecting to any of the switches.

Re: Packet loss after FTTP upgrade

ptrduffy — Wed, 27 Sep 2023 14:47:31 GMT

You seem to have established yourself that the issue is with your switches rather than the FTTP connection.

Are the switches that are giving issues possibly lower speed (e.g. 100Mbps interfaces, slower backplanes) and so possibly causing a bottleneck in the end-to-end connections?

Re: Packet loss after FTTP upgrade

Finkfan77 — Wed, 27 Sep 2023 15:22:13 GMT

Yes, it does seem to be the switches that are at fault. It’s just very odd to me that they have started to fail after upgrading to a higher speed.
All switches are Cisco gigabit and one it just about 12 months old. The others are 3-4 years old. I have replaced one with a Netgear gigabit which appears to be working fine.

Re: Packet loss after FTTP upgrade

ptrduffy — Wed, 27 Sep 2023 21:36:25 GMT

If they're mainly Cisco switches, are you sure that the config on them is correct? Specifically that they're set to 1Gbps, full-duplex, no problems with ACLs and the like? Those switches are generally capable, but also need to be set up properly (former Cisco engineer here).

Re: Packet loss after FTTP upgrade

Finkfan77 — Thu, 28 Sep 2023 06:02:07 GMT

They are all unmanaged switches