[c-nsp] Lot of input errors on a NPE-G1 interface

[gal.9430 at googlemail.com]

Hi,

I've some trouble with a NPE-G1 interface connected to a Catalyst
2960G switch via multimode cable. Input errors increases very fast.
Optics on both sides are original cisco. Average bandwidth is ~30-50
Mbps, burst bandwidth ~80-100 Mbps for a short period.

Configuration NPE-G1 interface:
----------------------------------------------
interface GigabitEthernet0/1
 ip address x.x.x.x 255.255.255.240
 no ip proxy-arp
 ip route-cache flow
 duplex full
 speed 1000
 media-type gbic
 negotiation auto
 ipv6 address x:x:x::x/64
 no cdp enable

Configuration switch interface:
--------------------------------------------
!
interface GigabitEthernet0/23
 description Cisco7204VXR
 switchport access vlan 250
 switchport mode access
 spanning-tree portfast
!

Uptime:
-----------
Router uptime is 9 hours, 14 minutes
System returned to ROM by bus error at PC 0x621E0668, address
0x18680DD8 at 22:37:34 MET Tue May 22 2012
System restarted at 22:40:33 MET Tue May 22 2012
System image file is "disk2:c7200-adventerprisek9-mz.124-15.T13.bin"

NPE-G1:
------------
GigabitEthernet0/1 is up, line protocol is up
  Hardware is BCM1250 Internal MAC, address is 0006.52f4.d81b (bia
0006.52f4.d81b)
  Internet address is x.x.x.x/28
  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, 1000Mb/s, link type is autonegotiation, media type is SX
  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 never
  Input queue: 0/75/1321/1 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 4264000 bits/sec, 871 packets/sec
  5 minute output rate 5859000 bits/sec, 1597 packets/sec
     27479327 packets input, 3434822229 bytes, 0 no buffer
     Received 941 broadcasts, 0 runts, 0 giants, 0 throttles
     989 input errors, 0 CRC, 0 frame, 989 overrun, 0 ignored
     0 watchdog, 17119 multicast, 0 pause input
     0 input packets with dribble condition detected
     43616309 packets output, 2243854018 bytes, 0 underruns
     5 output errors, 0 collisions, 4 interface resets
     561 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     5 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

Catalyst:
--------------
GigabitEthernet0/23 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 04fe.7f65.2197 (bia 04fe.7f65.2197)
  Description: Cisco7204VXR
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 5582000 bits/sec, 1596 packets/sec
  5 minute output rate 5445000 bits/sec, 1002 packets/sec
     160765357185 packets input, 75815081907836 bytes, 0 no buffer
     Received 580911 broadcasts (468086 multicasts)
     0 runts, 0 giants, 0 throttles
     5 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 468086 multicast, 343548 pause input
     0 input packets with dribble condition detected
     116641123524 packets output, 71833102673211 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

The last uptime was nearly 70 days and input errors round about 96k.
Does anyone have an explanation for that?


Thanks