[c-nsp] Cisco 7206 NPE-G1 with ouput drops

[Rodney Dunn]

On Mon, Sep 19, 2005 at 05:18:08PM +0200, Thomas Braun wrote:
> Hi,
> 
> our cisco 7206 with a NPE-G1 has a lot of output drops, but we haven't
> found the reason.
> I first captured this output:
> Input queue: 1/75/90/10 (size/max/drops/flushes); Total output drops: 553566
> 
> After a cap of 3 seconds i got this:
> Input queue: 3/75/90/10 (size/max/drops/flushes); Total output drops: 555262


Can you get a couple snapshots of 'sh int stat' after you clear the counters.

> 
> On the other site is a foundry switch it has no input errors or output
> errors.
> The interfaces, on both systems, are running with 1000Base-T Full-Duplex.
> 
> The CPU level is ok
> CPU utilization for five seconds: 31%/29%; one minute: 35%; five
> minutes: 34%
> and the memory utilisation is also OK:
> 
>                Head    Total(b)     Used(b)     Free(b)   Lowest(b) 
> Largest(b)
> Processor   62AEE3C0   458299480   167317132   290982348    16516772  
> 273750124
>       I/O    E000000    33554432     8711024    24843408    24782320   
> 24793400
> 
> The Cisco is running 12.2.25S5
> 
> We  have found the command "#sh ip cef switching statistics" it shows us
> a high drop rate under "RP PAS Features"  line
> RP PAS Features                   107436199          0        206
> 1 second cap:
> RP PAS Features                   107504040          0        206

I haven't looked at this too much yet but it's some new debugging
added in the CEF path as a result of the new feature handling.

Try and correlate these drops to the output drops and see if they
go up about the same rate.

> 
> But we haven't found an explanation to that line.
> 
> Could that be the problem or has anyone a hint how to find the problem?
> 
> On the interface is a load of 160 Mbit,
> 
> Here are 2 outpus with sh int gi0/2 with a gap of 3 seconds:
> GigabitEthernet0/2 is up, line protocol is up
>   Hardware is BCM1250 Internal MAC, address is 0001.6393.781a (bia
> 0001.6393.781a)
>   MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
>      reliability 255/255, txload 40/255, rxload 40/255
>   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 off, input flow-control is off
>   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 00:33:30
>   Input queue: 1/75/90/10 (size/max/drops/flushes); Total output drops:
> 553566
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   30 second input rate 157353000 bits/sec, 40785 packets/sec
>   30 second output rate 160693000 bits/sec, 33750 packets/sec
>      83649264 packets input, 1216325537 bytes, 0 no buffer
>      Received 0 broadcasts (0 IP multicast)
>      0 runts, 0 giants, 0 throttles
>      0 input errors, 0 CRC, 0 frame, 291 overrun, 0 ignored
>      0 watchdog, 127703 multicast, 0 pause input
>      69783636 packets output, 3884779920 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
> 
> GigabitEthernet0/2 is up, line protocol is up
>   Hardware is BCM1250 Internal MAC, address is 0001.6393.781a (bia
> 0001.6393.781a)
>    MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
>      reliability 255/255, txload 40/255, rxload 40/255
>   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 off, input flow-control is off
>   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 00:33:36
>   Input queue: 3/75/90/10 (size/max/drops/flushes); Total output drops:
> 555262
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   30 second input rate 157605000 bits/sec, 40660 packets/sec
>   30 second output rate 158627000 bits/sec, 33484 packets/sec
>      83890435 packets input, 1334523176 bytes, 0 no buffer
>      Received 0 broadcasts (0 IP multicast)
>      0 runts, 0 giants, 0 throttles
>      0 input errors, 0 CRC, 0 frame, 292 overrun, 0 ignored
>      0 watchdog, 128338 multicast, 0 pause input
>      69977234 packets output, 3995906900 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
> 
> 
> Thanks for your answers.
> 
> cu thomas
> 
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