nanog mailing list archives

Re: Byte Counters on Ciscos


From: Dean Anderson <dean () av8 com>
Date: Mon, 25 Jan 1999 14:11:51 -0500

Cisco stores them as 32 bits, but SNMP also retrieves them as 32 bits.  HP
has a proprietary MIB & impl. for its Lanprobes & RMON s/w for HP
workstations, which is 64 bits wide.  These are the only devices I know of
that store more than 32 bits, and have accurate counts of bytes over a long
period of time.

So on ciscos, you should clear counters before they can roll over.

You should really have a raffle to guess the uptime on your router. ;-)

                --Dean


At 10:46 AM 1/25/1999 -0500, alex () nac net wrote:


I am working on some byte counting stuff, and have a odd question.

I noticed on my of my routers:

    2403558863 packets input, 2476827328 bytes

thats:

    2,403,558,863 packets input, 
    2,476,827,328 bytes


which when divided out, comes to 1.03 bytes per packet, which without
saying is obviously in error.

So, when does a Cisco counter 'flip' ? How many bits is it?


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      Alex Rubenstein, alex () nac net, KC2BUO, ISP/C Charter Member
              Father of the Network and Head Bottle-Washer
    Net Access Corporation, 9 Mt. Pleasant Tpk., Denville, NJ 07834
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           Plain Aviation, Inc                  dean () av8 com
           LAN/WAN/UNIX/NT/TCPIP          http://www.av8.com
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