Route Summarization

Answered Question
May 25th, 2010

All, we've created the following internal networks and want to ensure that we correctly advertise with route summarization accordingly. What should the correct summarized route statement look like?

Subnets

30 /24bit user data/voip networks 10.122.[1-30].0 /24

20 /26bit server/printer/data networks 10.122.[31-40].0 .64.128.192 /26

15 /27bit networks 10.122.[41-45].0 .32.64.96.128.160.192.224 /27

Any help would be appreciated

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Correct Answer by Jon Marshall about 6 years 8 months ago

vpollifrone wrote:

All, we've created the following internal networks and want to ensure that we correctly advertise with route summarization accordingly. What should the correct summarized route statement look like?

Subnets

30 /24bit user data/voip networks 10.122.[1-30].0 /24

20 /26bit server/printer/data networks 10.122.[31-40].0 .64.128.192 /26

15 /27bit networks 10.122.[41-45].0 .32.64.96.128.160.192.224 /27

Any help would be appreciated

You can't summarise in one statement unless you want to include more networks than you have ie.

10.122.0.0 255.255.192.0    would summarise  10.122.0.0 -> 10.122.63.0

If you only want to summarise the actual networks you have  -

10.122.0.0 255.255.224.0  =  10.122.0.0 -> 10.122.31.0

10.122.32.0 255.255.248.0  =  10.122.32.0 -> 10.122.39.0

10.122.40.0 255.255.252.0 =   10.122.40.0  -> 10.122.43.0

10.122.44.0 255.255.254.0  =  10.122.44.0 -> 10.122.45.0

note the last 4 entries above could be replaced by

10.122.32.0 255.255.240.0  but this would include a few extra networks at the end because it works out as  10.122.32.0 -> 10.122.47.0

Jon

Correct Answer by Ganesh Hariharan about 6 years 8 months ago

All, we've created the following internal networks and want to ensure that we correctly advertise with route summarization accordingly. What should the correct summarized route statement look like?

Subnets

30 /24bit user data/voip networks 10.122.[1-30].0 /24

20 /26bit server/printer/data networks 10.122.[31-40].0 .64.128.192 /26

15 /27bit networks 10.122.[41-45].0 .32.64.96.128.160.192.224 /27

Any help would be appreciated

Hi,

Check out the below link for example on route summarization with step by step procedure to summarize a network to advertise.

http://www.ciscopress.com/articles/article.asp?p=174107&seqNum=3

Hope to Help !!

Ganesh.H

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Correct Answer
Ganesh Hariharan Tue, 05/25/2010 - 09:48

All, we've created the following internal networks and want to ensure that we correctly advertise with route summarization accordingly. What should the correct summarized route statement look like?

Subnets

30 /24bit user data/voip networks 10.122.[1-30].0 /24

20 /26bit server/printer/data networks 10.122.[31-40].0 .64.128.192 /26

15 /27bit networks 10.122.[41-45].0 .32.64.96.128.160.192.224 /27

Any help would be appreciated

Hi,

Check out the below link for example on route summarization with step by step procedure to summarize a network to advertise.

http://www.ciscopress.com/articles/article.asp?p=174107&seqNum=3

Hope to Help !!

Ganesh.H

Remember to rate the helpful post

Correct Answer
Jon Marshall Tue, 05/25/2010 - 09:53

vpollifrone wrote:

All, we've created the following internal networks and want to ensure that we correctly advertise with route summarization accordingly. What should the correct summarized route statement look like?

Subnets

30 /24bit user data/voip networks 10.122.[1-30].0 /24

20 /26bit server/printer/data networks 10.122.[31-40].0 .64.128.192 /26

15 /27bit networks 10.122.[41-45].0 .32.64.96.128.160.192.224 /27

Any help would be appreciated

You can't summarise in one statement unless you want to include more networks than you have ie.

10.122.0.0 255.255.192.0    would summarise  10.122.0.0 -> 10.122.63.0

If you only want to summarise the actual networks you have  -

10.122.0.0 255.255.224.0  =  10.122.0.0 -> 10.122.31.0

10.122.32.0 255.255.248.0  =  10.122.32.0 -> 10.122.39.0

10.122.40.0 255.255.252.0 =   10.122.40.0  -> 10.122.43.0

10.122.44.0 255.255.254.0  =  10.122.44.0 -> 10.122.45.0

note the last 4 entries above could be replaced by

10.122.32.0 255.255.240.0  but this would include a few extra networks at the end because it works out as  10.122.32.0 -> 10.122.47.0

Jon

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