North American Network Operators Group

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Re: Ethernet EP - MAC Address Filtering

  • From: Lane Patterson
  • Date: Tue Feb 12 00:10:04 2002

I'm aware that Juniper GigE interfaces support a mac-filter-list.  I'm
not well versed on which versions of Cisco router products support this
well (and line rate), but I didn't think GSRs and 7xxx had any support for 
this.  Are the L2/L3 family (65xx, 76xx) able to handle mac-filters at
line rate w/o a slow path?

I too would be interested in knowing if folks perform mac-filtering.

Certainly there are other measures you can take as well, such as scripting
some default-pointing traceroute checks, to check both peers and non-peers
on an IXP fabric.  These have been documented at various times, and Avi
at one point posted some form of this to Nanog (moons archives).

My impression of "best practices" would be to:

	1.  implement mac-filter or mac-counters to prevent
		any illegally statically routed non-peer traffic.
	2.  implement traceroute scripts to check that peers are
		not defaulting any partial transit thru you.

Feedback welcome :-)


On Fri, Feb 08, 2002 at 10:29:07AM -0800, David McGaugh <[email protected]> wrote:

> Hello NANOG,
> 	Just curious if anyone is performing MAC Address Filtering at any of
> the Ethernet Exchange Points. If so has it been found to be easy to
> administer or difficult where by peers may be changing Layer 3 devices
> or Interfaces without notice? Alternately is MAC Address Filtering
> considered an unneeded security measure?
> Thanks,
> Dave
Content-Description: Card for Dave McGaugh