From: jonatale@xxxxxxxxxxxxx
Date: Sat Oct 06 2001 - 03:00:06 GMT-3
Sure, that would be good.
I think it's a pretty cool thing. So folks can just put it in on their own
Excel, here it is in text (for one byte, the other 5 bytes are obviously the
same):
cell B1: <type in the byte you want swapped (in hex) here >
cell B2: = HEX2BIN(B1, 8)
cell B3: = HEX2DEC(B1)
cell B4: = MOD(B3,2)
cell B5: = MOD(TRUNC(B3/2),2)
cell B6: = MOD(TRUNC(B3/4),2)
cell B7: = MOD(TRUNC(B3/8),2)
cell B8: = MOD(TRUNC(B3/16),2)
cell B9: = MOD(TRUNC(B3/32),2)
cell B10: = MOD(TRUNC(B3/64),2)
cell B11: = MOD(TRUNC(B3/128),2)
cell B12: = B4 * 128 + B5 * 64 + B6 * 32 + B7 * 16 + B8 * 8 + B9 * 4 + B10 * 2
+
B11
cell B13: = DEC2BIN(B12, 8)
cell B14: = DEC2HEX(B12) <------------------------<the swapped byte (in hex)
will appear here>
Then I copy the B column to C thru G. Then I squeeze out rows 2 thru 13 since I
don't need to see those. Then:
cell A1: MAC in:
cell A14: BitSwap'dMAC out:
Here is a sample for one byte:
51
01010001
81
1
0
0
0
1
0
1
0
138
10001010
8A
Or you could use Crisco's tool which is a little cleaner, but if you take the
time to code this in then you will definitely understand bitswapping. My advice
is to be able to quickly do it (as well as bin to hex, hex to dec, etc.) on
paper, if not in your head.
Jeff Kesemeyer wrote:
> If you want me to put in on my web page so you have a link I would be
> willing,
>
> HTH,
>
> Jeff Kesemeyer
> CCNP, CCDP, MCSE, CNE
> www.bradshawlabs.com
> "Your CCIE Rack Rental Source"
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> jonatale@earthlink.net
> Sent: Friday, October 05, 2001 11:10 AM
> To: Jon Carmichael; michael robertson; ccielab@groupstudy.com
> Subject: Re: need advice for DLSW+
>
> looks like you can't do attachments, sorry
>
> jonatale@earthlink.net wrote:
>
> > I created this bitswap tool in Excel, for those that don't have a login.
> >
> > (you may need to do: Tools->Add-Ins->Analysis ToolPak, to get the HEX2BIN,
> etc.
> > functions)
> >
> > Jon Carmichael wrote:
> >
> > > You need advice about DLSW+, -and since I've read so much on it, --I
> have
> > > some recommendations about what I've found. Please forgive me bitching
> and
> > > griping about Caslow somewhere in the middle.
> > >
> > > Caslow seems to cover Frame Relay very well and with a lot of
> detail, --but
> > > I've been very disappointed in Caslow in all the other areas. I bought
> both
> > > first and second edition, where he was very broad in topics but depth
> was
> > > sorely lacking in some areas. His coverage of DLSW is mediocre, --a
> good
> > > introduction but not as in-depth as you need. For just a sentence or
> two I
> > > must say about Caslow that his coverage of multicast in the second
> edition
> > > is totally pitiful and downright wrong! He implies that when doing
> > > multicast you can choose several multicast routing protocols, and then
> says
> > > multicast OSPF is one of them, --not true, --cisco does not support
> MOSPF in
> > > any way, -obviously he was writing with very minimal knowledge of that
> > > topic! He gives a single example about PIM dense-mode, --and nothing of
> PIM
> > > sparse-mode, --leaving you totally unprepared for the lab exam, --but
> your
> > > question was not about multicast.
> > >
> > > After you've read about DLSW in Caslow, -I've found that Nam-Kee,
> > > "Configuring Cisco Routers for Bridging, DLSW+ & Desktop Protocols" was
> > > useful. Altho Nam-Kee is a very poor writer, with a lot of repeating
> > > himself, --he does go deeper than Caslow.
> > >
> > > To be very thorough, --nothing beats CCO! These are the URLs that are
> the
> > > best I've found. If anybody else has any to add to this short list, --I
> > > would appreciate a message back.
> > >
> > > http://www.cisco.com/warp/public/698/acl200.html
> > >
> > > http://www.cisco.com/warp/public/697/dlswfilter.shtml#macfilter4
> > >
> > > The above are foundational stuff on filtering...
> > >
> > > This can provide additional information about DLSW troubleshooting.
> > >
> > > http://www.cisco.com/warp/public/697/6.html
> > >
> > > And lastly the bitswapping tool, --but you need a login.
> > >
> > > http://www.cisco.com/cgi-bin/Support/Bitswap/bitswap.pl
> > >
> > > ***
> > >
> > > JONC
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > > michael robertson
> > > Sent: Sunday, September 30, 2001 3:12 PM
> > > To: ccielab@groupstudy.com
> > > Subject: need advice for DLSW+
> > >
> > > Hi, Dear friends,
> > >
> > > I am reading CASLOW DLSW+ at the moment, I am not sure
> > > whether I need to read APPN, SDLC, QDLC, RSRB etc more
> > > detail than the book. WHat will be the good materials
> > > if i need it?
> > >
> > > How about CISCO SNAM course materials, I have that
> > > material and it will help. But not sure whether I need
> > > to read all of the book.
> > >
> > > ANy recommendation will be appreciated
> > >
> > > regards
> > >
> > > michael
> > >
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