link monitoring

Pete Rohrman prohrman at
Thu Apr 29 21:04:57 UTC 2021

I'll sell you my Solar Winds license - cheap!

Pete Rohrman
Stage2 Support
212 497 8000, Opt. 2

On 4/29/21 4:39 PM, Baldur Norddahl wrote:
> Hello
> We had a 100G link that started to misbehave and caused the customers 
> to notice bad packet loss. The optical values are just fine but we had 
> packet loss and latency. Interface shows FEC errors on one end and 
> carrier transitions on the other end. But otherwise the link would 
> stay up and our monitor system completely failed to warn about the 
> failure. Had to find the bad link by traceroute (mtr) and observe 
> where packet loss started.
> The link was between a Juniper MX204 and Juniper ACX5448. Link length 
> 2 meters using 2 km single mode SFP modules.
> What is the best practice to monitor links to avoid this scenarium? 
> What options do we have to do link monitoring? I am investigating BFD 
> but I am unsure if that would have helped the situation.
> Thanks,
> Baldur

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