Route Summarization

[vpollifrone]

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

[Ganesh Hariharan · Accepted solution]

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

[Jon Marshall · Accepted solution]

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

[vpollifrone]

thanks for the help, much appreciated