02-10-2015 06:27 AM - edited 03-07-2019 10:35 PM
I am using RIPv2 no auto summary and then manually summarizing on specific interfaces. It appears that the manual summarization on one interface is overriding the manual summarization on a different interface. This may be by design but here is what I have on each interface:
Router 1
SVI10
ip summary-address rip 10.0.0.0 255.252.0.0
SVI11
ip summary-address rip 10.0.0.0 255.248.0.0
Before I entered the summary address on SVI11, the router was advertising 10.0.0.0/14 out of the SVI10 interface. After entering the manual summarization on SV11, the SVI10 interface started summarizing 10.0.0.0/13. The way I understand manual summarization is that this is per interface. Why does SVI11 summary override the other interface SVI10 summary?
02-10-2015 07:30 AM
Phil
What does the network look like ?
Where are you seeing the effects of the summarisation ie. on what device ?
Jon
02-10-2015 08:44 AM
ASA ----- 3750-1 (x.x.x.1) ------- (x.x.x.2) 3750-2 ----- ASA
The 3750-1 has the network 10.0.0.0/14.
The 3750-2 has the network 10.4.0.0/14
IP summary-address rip 10.0.0.0/14 on the 3750-1 .1 interface
IP summary-address rip 10.4.0.0/14 on the 3750-2 .2 interface
IP summary-address rip 10.0.0.0/13 on the 3750-1 to ASA interface
The last command is what creates the 10.0.0.0/13 summary on the 3750-1.1 interface. Even though I only have 10.0.0.0/14 entered on this interface, it appears that the /13 trumps this. It looks like ip summary only stores the most summarized address in the rip database which overrides the summary on the 3750-1.1 interface.
02-10-2015 09:13 AM
Hi Phil,
yes, it´s how RIPv2 works. When you apply summarization it´s subject to a subnet of this aggregate being in the RIP database.
Best Regards,
Jose.
02-10-2015 09:39 AM
I was hoping this was something that I was doing wrong or a bug. This means that I will need to manually summarize two routes instead of one from the 3750-1 to ASA.
interface 3750-1 to ASA
ip summary-address rip 10.0.0.0 255.252.0.0
ip summary-address rip 10.4.0.0 255.252.0.0
Then on the interface between the 3750's
ip summary-address rip 10.0.0.0 255.252.0.0
This works, but without the ability to summarize 10.0.0.0 255.248.0.0 on the 3750-1 to ASA interface.
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