I have an ASA firewall in production. When I issue the show interface command, there are lots of underruns and it keeps increasing. I have change the LAN cable, reset the interface, enable and disable flow control and even changed the device connected to that interface. Has anyone experienced this? Any suggestions?
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as stated in https://supportforums.cisco.com/discussion/10780211/help-underrun-errors : underruns occours when rx-ring is full (unable to accept more pkts); it mean that NIC is unable to pass data to IP level at same speed they arrive at NIC.