From: David Anderson (dma@xxxxxxxxx)
Date: Sat Apr 07 2001 - 23:31:10 GMT-3
I have thought about it a little more and this is what I came up with:
If you are using DLSW, it automatically converts all MAC addresses to
noncanonical form and then back again (if running Ethernet to
Ethernet). So, if you are doing filtering on your routers running DLSW,
you have to remember that when specifying the mac addresses in which to
filter it is in noncanonical form and not the actual form the Ethernet end
device sees it in. You can perform bitswapping manually in order to verify
you are filtering or not filtering the correct addresses.
David
At 09:22 PM 4/7/2001 -0500, Andres Zeller wrote:
>Convert host ethernet addresses when?
>
>Fred Ingham wrote:
>
> > David: MAC filters in DLSW always use the non-canonical form. This is
> > the address you would see in the reachability cache. Convert host
> > ethernat addresses, don't convert host token-ring addresses.
> >
> > Cheers, Fred
> >
> > David Anderson wrote:
> > >
> > > I have my lab in a couple of weeks and just wanted to make sure I am
> clear
> > > on something...
> > > I understand how to convert canonical to noncanonical and vice versa. I
> > > just want to make sure that the time to use this is when DLSW
> automatically
> > > converts mac addresses to noncanonical form. You want to make sure
> you are
> > > filtering for the actual mac address vs. the DLSW converted mac
> address, or
> > > the other way around ....well you know what I mean.....am I right??
> > > Thanks,
> > > David
David Anderson
Network Design Engineer
Enterprise Solutions Architecture & Design
(408) 853-5515
dma@cisco.com
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