Insane Interface Input/Output Rate Counters

Insane Interface Input/Output Rate Counters

Post by Nick Montan » Wed, 25 Jun 2003 09:06:58



Has anyone ever seen ridiculous input/output rate counters on multiple
interfaces?

Example (T1 interface on 7513 running 12.2(13)T1):

AR04#sh int s1/0/0/7:0
Serial1/0/0/7:0 is up, line protocol is up
  Hardware is cyBus 2CT3+
  Description: <snip>
  Internet address is <snip>
  MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 211/255
  Encapsulation PPP, LCP Open
  Open: IPCP, crc 16, loopback not set
  Last input 00:00:01, output 00:00:12, output hang never
  Last clearing of "show interface" counters 01:07:55
  Input queue: 0/75/0/7 (size/max/drops/flushes); Total output drops:
22
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/22 (size/max total/threshold/drops)
     Conversations  0/149/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1152 kilobits/sec
  5 minute input rate 8987000 bits/sec, 2879 packets/sec
  5 minute output rate 6000 bits/sec, 839437 packets/sec
     358383 packets input, 140407904 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     37973436 packets output, 61899 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 304 output buffers swapped out
     0 carrier transitions no alarm present
  Timeslot(s) Used: 1-24, Transmitter delay is 0 flags, transmit queue
length 5
  non-inverted data

Obviously my T1 customer is not pushing almost 9mbps across a T1.
What gives?  Couldn't find anything in the Bug Toolkit.

TIA

 
 
 

Insane Interface Input/Output Rate Counters

Post by Terry Baransk » Wed, 25 Jun 2003 11:47:01




Quote:>Has anyone ever seen ridiculous input/output rate counters on multiple
>interfaces?

This comes up reguarly -- for whatever reason, Cisco has been having
these types of interface counter issues in IOS for years.  Not all
versions are affected: in some versions the counters are reliable and
in others they aren't.  If changing to an IOS version that has
reliable counters is an option for you, I'd suggested posting to the
Cisco-NSP mailing list and inquiring about a recommended version for
your platform.  A good number of people there often share their
experiences with various IOS versions and interface counter accuracy
(it's a serious problem for ISP's as you can imagine).

 
 
 

Insane Interface Input/Output Rate Counters

Post by Nick Montan » Fri, 27 Jun 2003 17:50:20


Thanks for the info.  Funny thing is, our RRD/Cricket data, which is
pulled via SNMP and is also how we bill our customers, is perfectly
accurate.  I just like to have real-time info once in a while when I'm
troubleshooting something.



> >Has anyone ever seen ridiculous input/output rate counters on multiple
> >interfaces?

> This comes up reguarly -- for whatever reason, Cisco has been having
> these types of interface counter issues in IOS for years.  Not all
> versions are affected: in some versions the counters are reliable and
> in others they aren't.  If changing to an IOS version that has
> reliable counters is an option for you, I'd suggested posting to the
> Cisco-NSP mailing list and inquiring about a recommended version for
> your platform.  A good number of people there often share their
> experiences with various IOS versions and interface counter accuracy
> (it's a serious problem for ISP's as you can imagine).

 
 
 

1. SUMMARY: Cisco serial interface input output data rates and load

Thanks a million to the excellent people on the cisco and snm lists.

The Multi-Router Traffic Graphing Tool is exactly what I needed.

Gautam
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