topic Re: SDWAN Shus Down an interface every few minutes in General Topics

SDWAN Shus Down an interface every few minutes

JimDeMayo — Thu, 11 May 2023 01:44:13 GMT

SDWAN.1 is Xfinity comcast no issue ( cable modem 500 down 30 up)

SDWAN PROFILE. set to ethernet even though it is a cable modem circuit with an ethernet handoff

SDWAN.1 TIER 1 ISP. Bouncing every few minutes based on SDWAN probing.

SDWAN PROFILE

Tried AGGRESSIVE vs RELAXED

Tried ETHERNET vs Fiber link.

The Tier1 carrier and I have verified evrything with the circuit and see no issues.

MTR on the TIER1 network of course limits icmp so observed packet loss is not relevant since it is at only 1 hop where the policers are applied

Maybe there is a better way or something I am missing for SDWAN circuit health

Re: SDWAN Shus Down an interface every few minutes

delliott_6784 — Fri, 12 May 2023 15:36:07 GMT

Look for TCP retransmissions in pcaps as windows ramp up during transmits. Might be a MTU issue. set your MTU down to low 1430 to test if currently at 1500.

Re: SDWAN Shus Down an interface every few minutes

JimDeMayo — Fri, 12 May 2023 20:13:57 GMT

this is a Direct Internet Access / ISP circuit not a tunnel

Re: SDWAN Shus Down an interface every few minutes

delliott_6784 — Mon, 15 May 2023 11:26:37 GMT

If the underlay is the issue and not the overlay SDWAN interfaces, I would look for layer 2 channel issues or seek help from Comcast support to remediate a MAC ghosting issue.