[c-nsp] NPE-G1 Interface errors / packetloss

[Alexander Fossa]

Hi,

We've been trying to diagnose a packetloss issue though one of our LNS's.

The NPE-G1 is connected directly to a SUP32 with traffic in the region of 50mbit.

At first we thought it was a dirty fibre / failed SFP, both have been replaced but the problem continues.

We then moved the main infrastructure VLAN off Gi0/3 to Gi0/1, hence ruling out the SUP32 port and the physical port on the NPE-G1. The errors followed....

I've been doing quite a bit of reading and think this might be something to do with microbursts.... but we've not had an increase in traffic, if anything a decrease.

Show interface stats from NPE-G1

GigabitEthernet0/1 is up, line protocol is up
  Hardware is BCM1250 Internal MAC, address is 0008.203e.441b (bia 0008.203e.441
b)
  Description: Link to BEDGE1.THE GI1/7
  MTU 9216 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 5/255, rxload 4/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, 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 16:39:10
  Input queue: 0/1500/97/4 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 18801000 bits/sec, 4990 packets/sec
  5 minute output rate 21289000 bits/sec, 5288 packets/sec
     152579806 packets input, 2828997929 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 142 overrun, 0 ignored
     0 watchdog, 265811 multicast, 0 pause input
     0 input packets with dribble condition detected
     161805464 packets output, 4109563833 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out
DSL1.THE#

Show interface stats from SUP32

edge1.the#sh int gi1/7
GigabitEthernet1/7 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is 0016.465e.3732 (bia 0016.465e.3732)
  Description: DSL1.THE_GI0/1
  MTU 9216 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 4/255, rxload 5/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is T
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:21, output never, output hang never
  Last clearing of "show interface" counters 16:25:18
  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 21224000 bits/sec, 5233 packets/sec
  5 minute output rate 19475000 bits/sec, 4943 packets/sec
     160219198 packets input, 76742158873 bytes, 0 no buffer
     Received 133662 broadcasts (133662 multicasts)
     47 runts, 0 giants, 0 throttles
     25065 input errors, 24986 CRC, 24939 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     151327463 packets output, 65370785219 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
edge1.the#

As you can see lots of CRC & Frame errors the SUP32 side, and a few overruns on the NPE-G1 side.

Any ideas / thoughts?

Thanks in advance,

Alex

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