Although, as I mentioned before, I think understanding the binary simplifies things.....
But I agree with your pints! If it works for you, do what you gotta do =) Mike W. "Gaz" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I'm wondering whether it's worth me trying to explain my thought process > after 6 pints of cider. But the six pints say YES - have a go. > I'm too lazy to do the binary. > > You've got to get used to the size of blocks involved with each mask. By > that, I mean a /30 immediately suggests blocks of four. A /29 blocks of > eight etc. > > You had four blocks of four (/30), so if they can be summarised in one > statement it will have to be a block of 16, which should immediately suggest > a /28. > > But!!! The blocks of 16 will be at 0, 16, 32......128, 144, 160....... > > This doesn't fit your group, so you're going to need more than one > statement. > > > With your second example.... > > Your /29 suggests blocks of 8. You have two blocks of 8, so IF it's going to > fit, it will be a block of 16, which is a /28. > > The blocks will be 0, 16, 32, 48, 64.......... > > and your two blocks fit fine in to the above (between 48 and 64), so the > summary address is 216.52.146.48 /28 > > > > Sorry if this is nonsense to some, but this is my thought process. I am not > capable of doing the binary in my head. This process becomes so simple once > you grasp it, and can be done in seconds for almost any summary address. > It doesn't take any special brain, because I'd be out of the running, it's > just hard to explain and grasp initally. > > Please let me know if I should give up now and go to bed. Until then, the > fridge (or cooler if you like) beckons. > > Cheers, > > Gaz > > > > > > ""Kage Roc"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I promise I will not be a knowledge leech, I will contribute what I know > as > > well. Ofcourse I do have a question regarding IP Summaization: Up > untill > > today I thought I had summarization down cold until I tried a few self > made > > excercises. The formula I used to gather a summ address was 2n=x. Thats > 2 > > to the n power equals x. > > x is the number of subnets that you want to summarize and n will be how > much > > you subtract from the lowest mask of those subnets. for example: > > > > > > 216.52.146.136/30 > > 216.52.146.140/30 > > 216.52.146.144/30 > > 216.52.146.148/30 > > > > using that formula the summ would be 216.52.146.136/28 which is not a > valid > > route. Hoever that formula works here: > > 216.52.146.48/29 > > 216.52.146.56/29 > > > > summ route: 216.52.146.48 /28 > > > > I guess my question is, what is the best/effective/convient way to derive > > summary addresses? Thanks for any input. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=42290&t=41998 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
