[c-nsp] Interface byte counters

[Amol Sapkal]

Hi,

On Wed, 8 Sep 2004 16:49:55 -0400, Rodney Dunn <rodunn at cisco.com> wrote:
> I sent 1 packet of 100 byte ping:
>
> 101_#sh int e0/0 | incl packets in
>      1 packets input, 114 bytes, 0 no buffer
> 
> So that's 72 bytes of data + 8 bytes of ICMP +
> 20 bytes of IP + 12 bytes of MAC + 2 bytes TYPE = 114
> so I'd say the answer is no the FCS isn't included.
> 
> Rodney
> 
>

If I am not wrong, the IP packet formation will be like that:
Pay load(100) + ICMP (8) + IP (20) = 128 bytes.

I am not getting as to why your router is showing anything less than 128 bytes?


 
> 
> On Fri, Sep 03, 2004 at 10:30:39AM -0600, Clinton Work wrote:
> > According to Cisco documentation the interface byte counters include the MAC
> > encapsulation. Does
> > this include the 4-byte FCS for ethernet II?
> >
> > router#show int fa0 | inc input|output
> >   Last input 00:00:03, output 00:00:00, output hang never
> >   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> >   5 minute input rate 64000 bits/sec, 113 packets/sec
> >   5 minute output rate 138000 bits/sec, 84 packets/sec
> >      8749777 packets input, 603929443 bytes
> >      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
> >      0 input packets with dribble condition detected
> >      6308549 packets output, 2950512478 bytes, 0 underruns
> >      0 output errors, 0 collisions, 4 interface resets
> >      0 output buffer failures, 0 output buffers swapped out
> >
> >
> >
> > =========================================================================
> > Clinton Work                                        clinton at scripty.com
> > Calgary, Alberta
> >
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> 
> 
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-- 
Warm Regds,

Amol Sapkal

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