In a message dated 12/24/2001 9:03:51 AM Central Standard Time, [EMAIL PROTECTED] writes:
> Subj:Re: How to Summarize Network Addresses [7:29149] > Date:12/24/2001 9:03:51 AM Central Standard Time > From: [EMAIL PROTECTED] (c1sc0k1d) > Sender: [EMAIL PROTECTED] > Reply-to: [EMAIL PROTECTED] (c1sc0k1d) > To: [EMAIL PROTECTED] > > Yeah, with all due respect, the CCIE Written is a QUALIFICATION EXAM, not a > cert......I wish people would not use it!! My .02c, Rob H. NP, DP, blah,blah,blah........ > > What is this new certification you have... the CCIE(Write)? Does that mean > you write code for the IOS? > > > > ""Sureshhomepage .com"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > thanks for the excellant notes! > > > > cheers! > > suresh CNE,MCSE+I,CLS,SCSA,CCNA,CCNP,MCNS,CCIE(Write) > > http://www.sureshhomepage.com > > > > > > >From: "John Neiberger" > > >Reply-To: "John Neiberger" > > >To: [EMAIL PROTECTED] > > >Subject: How to Summarize Network Addresses [7:29149] > > >Date: Thu, 13 Dec 2001 17:40:08 -0500 > > > > > >Someone just asked me off-list how to summarize a certain range of > > >addresses and I thought it might be helpful to post my reply to the > > >list. It seems like everybody has their own shortcut to doing this, but > > >this is how I learned how to do it. Once you learn it there are plenty > > >of shortcuts. > > > > > > > > > > > >As far as summarization goes, to really understand what you're doing > > >you need to think in binary. Write out those addresses in binary > > >first: > > > > > >00001010.00000001.00000001.00000000 = 10.1.1.0/24 > > >00001010.00000001.00000011.00000000 = 10.1.3.0/24 > > >00001010.00000001.00001110.01000000 = 10.1.14.64/26 > > > > > >You can see that in binary they are all the same up to the 20th bit. > > >If you slice the above table into two pieces at the 20th bit, on the > > >left side you are left with: > > > > > >00001010.00000001.0000 > > > > > >This, translated back to decimal, is 10.1.0.0/20, which is your > > >summarized address. However, this is an awful example. Those would be > > >really bad addresses to try to summarize. A better example would be > > >this: > > > > > >10.1.0.0/24 > > >10.1.1.0/24 > > >10.1.2.0/24 > > >10.1.3.0/24 > > > > > >00001010.00000001.00000000.00000000 > > >00001010.00000001.00000001.00000000 > > >00001010.00000001.00000010.00000000 > > >00001010.00000001.00000011.00000000 > > > > > >You can see that these are the same up to the 22nd bit. Slice the > > >diagram into to pieces at the 22nd bit and on the left side you are left > > >with: > > > > > >00001010.00000001.000000 > > > > > >which translates back to decimal as 10.1.0.0/22. Now you can see that > > >a /22 precisely summarizes four /24s !! Cool, huh? > > > > > > > > > > > >Regards, > > >JohnPrecedence: bulk Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=30039&t=29149 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
