This is a followup from https://phabricator.wikimedia.org/T346606#9174753 , namely to investigate the impact of setting max-repeaters = 20 in librenms for all devices, quoting @ayounsi :

In T346606#9174753, @ayounsi wrote:

Regarding max-repeaters it seems like a great win and we should look at applying it at scale after testing it on a router (done by Filippo above) and on a large switch stack eg. asw-a-codfw, or asw2-a-eqiad.

Risks I can think about are:

• overwhelm the network device
• get packets larger than the mtu causing weird issues if it can't fragment them
• another is to lose more data at once if a packet is lost

First one can be monitored to see if the memory or CPU increases, as well as if some data stop showing up (eg. SNMP daemon can't keep up)
Second is unlikely seeing the small size of the payload, as long as we keep the max-repeaters value small enough (I recommend we don't try to over-optimize it and keep it at 20).
Last is always a risk but data will show up at next pool. And packet loss is infrequent.