Upload/download speed differences

[ANDREW WIGHTMAN]

Hi there,

We run a very straighforward network with no QoS or anything implemented on it, but we are seeing a big difference in speeds - generally our download speed is good but the upload speed is bad - 80down/8up. This is between devices on our network or the Internet. We have a synchronous Internet connection which runs perfectly if we connect a laptop directly to the ISP router.

The ports all look clean, no speed/duplex issues at all:-

outbound Internet facing port:-

GigabitEthernet0/1 is up, line protocol is up
  Hardware is CN Gigabit Ethernet, address is e4d3.f11f.9c71 (bia e4d3.f11f.9c71)
  Description: Interconnect with ISP
  Internet address is #removed#
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1Gbps, media type is RJ45
  output flow-control is XON, input flow-control is XON
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 19:38:44
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 213
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 6042000 bits/sec, 987 packets/sec
  5 minute output rate 1105000 bits/sec, 755 packets/sec
     36483229 packets input, 398597023 bytes, 0 no buffer
     Received 1235 broadcasts (0 IP 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
     30596833 packets output, 2851841908 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     3 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

We have connected different switches and even different vendors switches and we still see the same issue.

Has anyone come across this before? We are about to remove the router and replace it with a different vendor, but the router seems fine generally - no high CPU usage, low throughput on the interfaces etc.

Regards

Andrew

[Leo Laohoo]

  Last clearing of "show interface" counters 19:38:44
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 213

You just cleared the counters and you're getting output drops?  That's not good.  Output drops originate from the downstream device.  This happens when the downstream device tells the upstream "back off, I'm about to barf!"

The interface is 1 Gbps copper link.  Can you verify that the downstream device can push this much?

[ANDREW WIGHTMAN]

Hi Leo,

Sorry for delay - yes the other end is a Gb port on the MPBN, interestingly we are seeing the same issue in another country with the same types of devices. I am trying to get a fibre connection to see if that solved the problem. When we manually change the speeds to 100Mb we have serious errors - I'm hoping a fibre connection will resolve this problem as 100Mb (if we install a 10Mb switch between the devices) isnt going to cut it as we expect about 260Mb of Internet traffic in about 6 months time.

Regards

Andrew