On the Cisco gear are you configuring "mtu" or "ip mtu" on the interface? I'm not sure which one Observium displays, but I'm sure a quick experiment on a spare switchport will answer your question :) .
Jacob Bisby
-----Original Message----- From: observium [mailto:observium-bounces@observium.org] On Behalf Of Jim Glassford Sent: Tuesday, 25 April 2017 10:21 PM To: observium@observium.org Subject: [Observium] Cisco switches showing wrong Packet Size
Hi,
No luck trying to review the Observium Archives see if this was asked before, getting a Not Found off the web link.
Running Observium 17.3.8438 (stable), question on MTU size on Cisco interfaces. On our HP ProCurve switches with Jumbo enabled, all displays correctly, see MTU as 9216 on the interfaces as expected. On our Cisco models with Jumbo enabled, MTU shows 1500 on Average Packet Size graph. I believe this is due to Cisco interfaces showing the MTU as 1500 even when Jumbo frames are enabled and are passing Jumbo on the switch interfaces. Seeing this on both Cisco models 2960s and 3K the Average Packet Size found to be 1500. Any chance someone have a work around for this Cisco problem, able to set the MTU up to 9216 for the interfaces?
Appreciated! Jim
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