[c-nsp] 2960s output drops

[Tom Sands]

Beware that the 2960S incurred a drastic reduction in packet buffers compared to prior the initial 2960 product line (cut the port buffers in half).

________________________________________
From: cisco-nsp-bounces at puck.nether.net [cisco-nsp-bounces at puck.nether.net] on behalf of Nikolay Shopik [shopik at inblock.ru]
Sent: Wednesday, April 04, 2012 1:54 PM
To: Piotr Wojciechowski
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 2960s output drops

Hardware is Gigabit Ethernet, address is 2c3f.386c.850c (bia 2c3f.386c.850c)
  Description: trestcom
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:01, output never, output hang never
  Last clearing of "show interface" counters 02:41:55
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2197
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 222000 bits/sec, 139 packets/sec
  5 minute output rate 779000 bits/sec, 159 packets/sec
     1001165 packets input, 123531512 bytes, 0 no buffer
     Received 30810 broadcasts (16248 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 16248 multicast, 0 pause input
     0 input packets with dribble condition detected
     1428427 packets output, 830613125 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     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


On 04.04.2012 21:58, Piotr Wojciechowski wrote:
> On 4/4/12 18:35 , Nikolay Shopik wrote:
>> Hi,
>>
>> So we just replaced some aging c3524XL with 2960S and suddenly start
>> seeing output drops on one of port facing client, while 3524 never had
>> output drops to this client.
>>
>> Traffic levels pretty much low like 1-2mbit with 200-300pps levels. I
>> believe this is because uplink now 1Gbit, but previously it was just
>> 100mbit and client port also 100mbit.
>>
>> But just wanna confirm with you guys should I ignore these drops or do
>> something about.
>
> What kind of drops are those? Can you provide us show interface output?
>
> Regards,
>
>
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