7206VXR GigE input errors/ignored packets

Unanswered Question

I have a 7206VXR that has been receiving input errors on the GigE ports.  We are a small ISP, and this is our edge router.  My boss (with mostly copper telephone experience) is convinced these errors are causing every single strange thing on our network, while I think they aren't much to worry about.  Hopefully someone can give me some ideas.


Port configuration is:


Serial 1/0 - DS3 to first upstream provider.

Gi 0/1 - GigE link to second upstream provider, next hop is Cat3560 (provider-owned) then converted to fiber.  We contract for 50Mbps on this circuit, which is the provider throttles at their head-end.

Gi 0/2 - GigE link to our network, connected to iPolicy firewall, then NetEqualizer bandwidth manager, then our Cat3560.  Trunk carries 6 VLANs.


Router has NPE-G2 processor, is running 12.4(11)T IOS, and has NAT and BGP in operation - we have about 150 users on NAT, the other 1500+ are on public IPs.  We very seldom receive errors off Se1/0.  I have port stats for the two GigE ports at the bottom, both for 5 minute periods.


Doing a 'debug ip error' seems to point to NAT timeouts - about 2/3 of the errors have a destination from my NAT pool with a 'dispose udp.noport' message.


I would appreciate any guidance on whether I should be concerned, and suggestions on corrective actions if needed.  Thanks in advance.


Louis




#sho int gi 0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is MV64460 Internal MAC, address is 0008.a4e9.2c1b (bia 0008.a4e9.2c1b)
   MTU 1500 bytes, BW 50000 Kbit, DLY 10 usec,
     reliability 255/255, txload 34/255, rxload 111/255
  Encapsulation ARPA, 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 00:04:58
  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 21774000 bits/sec, 3036 packets/sec
  5 minute output rate 6748000 bits/sec, 3132 packets/sec
     940499 packets input, 845923486 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     180 input errors, 0 CRC, 0 frame, 0 overrun, 180 ignored
     0 watchdog, 148 multicast, 0 pause input
     0 input packets with dribble condition detected
     970633 packets output, 260172899 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


#show int gi 0/2
GigabitEthernet0/2 is up, line protocol is up
  Hardware is MV64460 Internal MAC, address is 0008.a4e9.2c1a (bia 0008.a4e9.2c1a)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 254/255, txload 6/255, rxload 2/255
  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 00:05:01
  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 8165000 bits/sec, 3373 packets/sec
  5 minute output rate 24073000 bits/sec, 3841 packets/sec
     923522 packets input, 294899255 bytes, 0 no buffer
     Received 1446 broadcasts, 0 runts, 0 giants, 0 throttles
     9147 input errors, 0 CRC, 0 frame, 0 overrun, 9147 ignored
     0 watchdog, 4726 multicast, 0 pause input
     0 input packets with dribble condition detected
     1030977 packets output, 793217761 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

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paolo bevilacqua Fri, 03/26/2010 - 13:12
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G0/2 is not ok - too many ignores.


Can you relate these to traffic peaks / drops on serial (of which you have not sent the output) ?



Also since you're as  ISP, I would recommend you to run 12.2SRE - especially tailored and tested for you guys.

At a quick glance, it doesn't seem like the errors on Gi0/2 track with traffic on Se1/0.  Below is stats on all three ports from the same 5 min period.  Traffic was much higher on Se1/0 than in period in first post, but number of input errors on Gi0/2 are similar.


I'll look into going to 12.2SRE - I have a few versions of IOS, but not sure if I have that one stored.




#sho int gi 0/1

GigabitEthernet0/1 is up, line protocol is up

Hardware is MV64460 Internal MAC, address is 0008.a4e9.2c1b (bia 0008.a4e9.2c1b)

MTU 1500 bytes, BW 50000 Kbit, DLY 10 usec,

reliability 255/255, txload 25/255, rxload 115/255

Encapsulation ARPA, 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 00:05:01

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 22739000 bits/sec, 2872 packets/sec

5 minute output rate 5048000 bits/sec, 3014 packets/sec

831739 packets input, 803510646 bytes, 0 no buffer

Received 1 broadcasts, 0 runts, 0 giants, 0 throttles

180 input errors, 0 CRC, 0 frame, 0 overrun, 180 ignored

0 watchdog, 147 multicast, 0 pause input

0 input packets with dribble condition detected

890401 packets output, 186543890 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


#sho int gi 0/2

GigabitEthernet0/2 is up, line protocol is up

Hardware is MV64460 Internal MAC, address is 0008.a4e9.2c1a (bia 0008.a4e9.2c1a)

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 254/255, txload 10/255, rxload 1/255

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 00:05:01

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 7390000 bits/sec, 4020 packets/sec

5 minute output rate 41467000 bits/sec, 5472 packets/sec

1203035 packets input, 275241121 bytes, 0 no buffer

Received 1449 broadcasts, 0 runts, 0 giants, 0 throttles

9431 input errors, 0 CRC, 0 frame, 0 overrun, 9431 ignored

0 watchdog, 4768 multicast, 0 pause input

0 input packets with dribble condition detected

1672560 packets output, 1578908815 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


#sho int se 1/0

Serial1/0 is up, line protocol is up

Hardware is M1T-T3+ pa

MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,

reliability 255/255, txload 11/255, rxload 105/255

Encapsulation HDLC, crc 16, loopback not set

Keepalive set (10 sec)

Restart-Delay is 10 secs

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

Last clearing of "show interface" counters 00:04:57

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 18297000 bits/sec, 2556 packets/sec

5 minute output rate 2059000 bits/sec, 941 packets/sec

823575 packets input, 758104850 bytes, 0 no buffer

Received 30 broadcasts, 0 runts, 0 giants, 0 throttles

0 parity

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

290737 packets output, 77293897 bytes, 0 underruns

0 output errors, 0 applique, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

rxLOS inactive, rxLOF inactive, rxAIS inactive

txAIS inactive, rxRAI inactive, txRAI inactive

paolo bevilacqua Mon, 03/29/2010 - 08:52
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Are you connecting to something that doesn't support flow control ?

If so, please disable on rotuer as well.

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