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RE: mac-address accounting

  • From: Martin, Christian
  • Date: Fri Jun 01 09:53:03 2001

I think these maybe the Cisco LOOP pulses sent out to detect link status.
Lemme check in the lab...

chris

> -----Original Message-----
> From: Simon Leinen [mailto:simon@limmat.switch.ch]
> Sent: Friday, June 01, 2001 8:47 AM
> To: Alex Rubenstein
> Cc: nanog@merit.edu
> Subject: Re: mac-address accounting
> 
> 
> 
> >>>>> "ar" == Alex Rubenstein <alex@nac.net> writes:
> > core1.nyc#sho int g0/0/0 mac-accounting
> > GigabitEthernet0/0/0 to external peers and customers
> >   Output  (475 free)
> [...]
> >     0100.0c00.0000(13 ):  57198 packets, 37155973 bytes, 
> last: 388ms ago
> [...]
> > core1.nyc#sho arp | inc 0100
> > core1.nyc#
> 
> 01:00:0c is Cisco's Ethernet multicast address prefix.
> 01:00:0c:00:00:00 looks strange to me.
> 
> The cisco-nsp mailing list had a query about this problem:
> 
> http://puck.nether.net/lists/cisco-nsp/0318.html
> 
> But I don't know whether this has been resolved.  If I try outbound
> MAC accounting (usually I only use inbound MAC accounting at exchange
> points) on a 7206VXR running 12.0(17)S, everything looks fine.
> 
> > All the others are valid, yet they are way, and I mean *way* under
> > the amounts that I know I am sending to that peer.
> 
> (Maybe your Cisco multicasts all traffic out to the exchange point
> rather than send it to the correct peer - seems much more robust to
> me, although you might end up with heavy packet replication :-)
> -- 
> Simon Leinen				       simon@babar.switch.ch
> SWITCH				   
http://www.switch.ch/misc/leinen/

	       Computers hate being anthropomorphized.




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