From: Paglia, John (USPC.PCT.Hopewell) (JPaglia@NA2.US.ML.com)
Date: Wed Oct 09 2002 - 22:49:23 GMT-3
Since it 'depends on the actual question and what you're excluded from
doing', let's nail a scenario down...
? says: "Some routes will come to your router via rip. Summarize them before
they go into the ospf network using the shortest possible mask."
*this says to me that we are only concerned with these specific RIP
routes, which are in a different address range than my entire network, so
affecting my network's routes would kinda be impossible in this scenario.
Lets say my network is 172.16.0.0, and the 5 routes coming in from RIP are:
192.168.2.0
192.168.4.0
192.168.6.0
192.168.8.0
192.168.10.0
Given the 'shortest possible mask' specification, what would YOU put?
John
> -----Original Message-----
> From: Craig Tompkins [SMTP:craig.tompkins@verizon.net]
> Sent: Wednesday, October 09, 2002 9:30 PM
> To: 'Paglia, John (USPC.PCT.Hopewell)'; ccielab@groupstudy.com
> Subject: RE: Summarization of Routes
>
>
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> It all depends on the actual question and what you are excluded from
> doing.
> It may be really that you can cut it back to /16 and accomplish this.
> But can you go even farther back? Also the question may say
> summarize only the network included, which then means you cant go
> back that far because you would be summarizing more than is shown.
> So there is not really an easy answer as it depends on what you are
> excluded from doing. So make sure you look out for these exclusions.
> Such as summarize using shortest mask only the network below. Or
> something that says to specifically exclude a specific net.
>
>
> Craig W. Tompkins
> Network Engineer
> Temecula, CA 92592
> 760.583.6544
>
> "The credit belongs to the man who is actually in the arena, whose
> face is marred by dust and sweat and blood; who strives valiantly;
> who errs and comes short again and again, who knows the great
> enthusiasms, the great devotions, and spends himself in a worthy
> cause; who at best, knows the triumph of high achievement; and who,
> at the worst, if he fails, at least fails while daring greatly, so
> that his place shall never be with those cold and timid souls who
> know neither victory nor defeat."
> - -Theodore Roosevelt, "Citizen in a Republic", April 23, 1910
>
>
> - -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Paglia, John (USPC.PCT.Hopewell)
> Sent: Wednesday, October 09, 2002 4:47 PM
> To: 'ccielab@groupstudy.com'
> Subject: Summarization of Routes
>
> What is the real meaning of the question 'summarize to the shortest
> possible
> mask'?
>
> Example...suppose I am asked to 'summarize the routes received using
> the
> SHORTEST POSSIBLE MASK', and these are the routes received:
>
> 192.168.20.1 /24
> 192.168.50.1 /24
> 192.168.100.1 /24
> 192.168.190.1 /24
>
> My knee-jerk reaction was to go with 192.168.0.0 /16, but upon
> further
> thought, I could also summarize to a /13 mask and be able to ping all
> the
> above 'nets.
>
> Do ya think it would be wrong to do this on the test if it comes up,
> thus
> setting myself up for disaster? The 'shortest possible mask' stmnt.
> is
> really bothering me. Opinions please.
>
> Thanks,
> John
>
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