pause output

[mohanraj1]

Hi All,

i have a cisco 6509 switch and one of the interface is connected to the server. I'm seeing lot of pause output on that particular interface.

when i checked the load on the interface for the past one month , it is only 1 to 5% utilized (both input and output). Please help me on the pause output. The connectiviy to the server is facing frequent disconnection.

  Full-duplex, 1000Mb/s, media type is 10/100/1000BaseT

  input flow-control is off, output flow-control is on

  Clock mode is auto

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 00:00:00, output hang never

  Last clearing of "show interface" counters 3d00h

  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 685000 bits/sec, 178 packets/sec

  5 minute output rate 1384000 bits/sec, 245 packets/sec

     23852457 packets input, 17164191388 bytes, 0 no buffer

     Received 1087 broadcasts (8 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 0 multicast, 0 pause input

     0 input packets with dribble condition detected

     27087241 packets output, 15305053462 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 5994 PAUSE output

     0 output buffer failures, 0 output buffers swapped out

Regards,

Mohan N

[Leo Laohoo]

PAUSE output normally means that the remote end client is sending PAUSE to the switch port so it can process too much incoming traffic.

Try this:

1.  Downgrade your port speed to 100 Mbps;

2.  Clear your counters; and

3.  Observer for 4 hours or a day for any counter incrementing.

[nkarpysh]

Adding to previous answer. 

Statistics you watched is basically avaerage for some period of time (never momentary SNAP of current port rate). Even being averagely very lightly utilized interface based on traffic nature can send bursts affecting the server on the other side.

Please also note that this particular interface has flow control disabled on input "input flow-control is off". Thus it will ignore server's Pause frame and continue sending as it did before thus further congesting server's buffer.

Adding to previous recomendations you can consider the implementation of flow control on this interface for it to adjust traffic rate upon receiving the Pause frame from server.

Nik

[mikidvd]

I think the PAUSE OUTPUT actually means the number of pauses sent by your device.