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Home > Forums > Communications Rack > Networking > Cisco: Routers Forum

Route Summarization

Read More Threads Like This One

GreatApe (TechnicalUser)

4 May 12 19:57

I was wondering if it was possible to summarize a bunch of class C networks 192.168.16.0/24 - 192.168.255.0/24 with a summary route? Would it be 192.168.16.0 255.255.240.0 ?

unclerico (IS/IT--Management)

4 May 12 23:06

The summary route you listed would summarize 192.168.16.0 - 31.255 which would equate to 192.168.16.0/20 in CIDR or prefix notation. Now, if you want to summarize all the way up to 192.168.255.0/24 you would need to simply use 192.168.0.0/16

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)

VinceWhirlwind (TechnicalUser)

6 May 12 23:03

But if he wanted to exclude the first .16. then he would use your summary
192.168.16.0/20
and then
192.168.32.0/19 for the next 32
then
192.168.64.0/18 for the next 64
then
192.168.128.0/17 to take it the rest of the way

I think. I have a horrible cold today, so I am likely to be making stupid mistakes.

GreatApe (TechnicalUser)

21 May 12 22:31

Thanks Vince, thats perfect. I should have remembered this, but yeah basically due to sub-optimal network design I will end up having 4 routes in the table rather than 1!

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