[38230] in North American Network Operators' Group
RE: mac-address accounting
daemon@ATHENA.MIT.EDU (Martin, Christian)
Fri Jun 1 10:10:01 2001
Message-ID: <94B9091E1149D411A45C00508BACEB359CDB8A@entmail.gnilink.com>
From: "Martin, Christian" <cmartin@gnilink.net>
To: "Martin, Christian" <cmartin@gnilink.net>,
'Simon Leinen' <simon@limmat.switch.ch>,
Alex Rubenstein <alex@nac.net>
Cc: nanog@merit.edu
Date: Fri, 1 Jun 2001 10:08:34 -0400
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Whoops, mixed this up with ISL. This is ISL group 0.
sorry for the spewage..
chris
> 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.
>
