Consider the following output from show interface:

Interface GigabitEthernet0/1 "inside", is up, line protocol is up
  Hardware is i82546GB rev03, BW 1000 Mbps, DLY 10 usec
    Full-Duplex(Full-duplex), 1000 Mbps(1000 Mbps)
    Input flow control is unsupported, output flow control is off
    MAC address 5057.aaaa.25d7, MTU 1500
    IP address, subnet mask
    2708954646 packets input, 1614638330819 bytes, 0 no buffer
    Received 786860 broadcasts, 0 runts, 0 giants
    7262 input errors, 7262 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
    0 pause input, 0 resume input
    0 L2 decode drops
    2622997029 packets output, 1295347863682 bytes, 6396 underruns
    0 pause output, 0 resume output
    0 output errors, 0 collisions, 90 interface resets
    0 late collisions, 0 deferred
    0 input reset drops, 7908 output reset drops, 31 tx hangs

The last line says 31 tx hangs. What does this mean?

  • It's a very good question, as of today there is nothing in the ASA docs that I could find.
    – This
    Aug 21 '13 at 9:05

A hang usually refers to an ethernet frame transmission that "takes too long" resulting in a controller or interface reset. What "takes too long" means is a bit of a mystery though.

  • I'm not sure if it's the right answer, but it's the best answer so I'll give you credit for it.
    – tunnelsup
    Aug 29 '13 at 17:31

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