[c-nsp] packet drop due ti CAR (rate-limit)

[Muhammad Farooq]

We have 24 subinterfaces on this Fastethernet link and we are facing problem on all sub interfaces. We have other gigi interfaces on this router on which we are using dot1q but they are running perfectly. Please find below show rate-limit output for one of problematic interfaces.

FastEthernet3/0.8 Alfalah GHP
  Input
    matches: all traffic
      params:  512000 bps, 48000 limit, 96000 extended limit
      conformed 31000 packets, 23768856 bytes; action: transmit
      exceeded 310 packets, 287635 bytes; action: drop
      last packet: 32ms ago, current burst: 34513 bytes
      last cleared 00:06:55 ago, conformed 457000 bps, exceeded 5000 bps
  Output
    matches: all traffic
      params:  512000 bps, 48000 limit, 96000 extended limit
      conformed 24550 packets, 14268239 bytes; action: transmit
      exceeded 3 packets, 354 bytes; action: drop
      last packet: 44ms ago, current burst: 58 bytes
      last cleared 00:06:55 ago, conformed 274000 bps, exceeded 0 bps




----------------------------------------
> Subject: RE: [c-nsp] packet drop due ti CAR (rate-limit)
> Date: Mon, 13 Oct 2008 10:08:53 +0200
> From: oboehmer at cisco.com
> To: scorpianbiz at hotmail.com; cisco-nsp at puck.nether.net
> 
> Muhammad Farooq <> wrote on Monday, October 13, 2008 9:37 AM:
> 
>> Hi,
>> 
>> we are having packet drops issue due to rate limit on fastethernet of
>> 3845 router. We are using dot1q on that interface. If we remove
>> rate-limit then packet drop issue solves. Please note that with
>> increase in rate limit packet drop interval also increases and it
>> make a pattern. Output of show interface is pasted below. Running IOS
>> of router is c3845-advipservicesk9-mz.123-14.T7.bin and interface
>> utilization is not more that 35%      
>> 
>> interface FastEthernet3/0
>> no ip address
>> load-interval 30
>> duplex full
>> speed 100
> 
> can you show some iterations of "show int rate-limit" (best after "clear
> counter") Please bear in mind that TCP traffic can be very bursty and
> CAR/rate-limit can drop these bursts.. 
> 
> 	oli
> 

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