IP summary address

[Phil Bradley]

This is a two part question. Let's assume I have a router that we will call router1. On this router I have the networks 10.0.0.0/14 which will cover the range 10.0.0.0-10.3.255.255. Upstream from this router I have an asa that has a remote network of 10.27.0.0. Router2 has the networks 10.4.0.0/14. Router1 and Router2 use ripv2 and have auto summarization disabled. On R1's interface to R2, I will use the IP summary-address 10.0.0.0 255.252.0.0. Will I also need to include 10.27.0.0 255.255.255.0 in an IP summary-address as well? Or since my ripv2 process has network 10.0.0.0, then will this get sent anyway? I didn't know if when using manual summarization, then you would need to summarize all possible routes?

Next question. On the asa can I NAT the remote network of 10.27.0.0/24 to something that is contiguous on R1 so that it will be included in the manual summarization? Thanks!

[Cisco Freak]

If you use the summary address 10.0.0.0 255.252.0.0, any subnet falling in this range will be send as summary only.

ie, 101.1.1.0/24 will be a part of the summary and it will not be send separately.

However, 10.27.0.0 255.255.255.0 is not falling in the range of the summary address. Hence it will be sent separately by the RIP process.

CF

[Phil Bradley]

Thanks CF. This is exactly what I want it to do. Do you know if I can Nat the 10.27.0.0/24 range to something like 10.1.0.0/24 on the asa? This way I will have contiguous networks and one summary will get everything.

[Phil Bradley]

Another thing that I just noticed is that the ASA only appears to support summary addresses for EIGRP and not rip, or at least the ip summary-address rip is not available in my version. This has an older image which is 8.0(3). Does anyone know if there is support for summarization on the ASA?