In our environment, we typically have a layer 3 switch running several vlans and 2 WAN routers with Internet T1 circuits. On these WAN routers, we make IPSec/GRE VPN tunnels back to our headquarters. Our environment runs EIGRP and is all one AS so the switches and routers in a site are neighbors and the VPN routers in the branch and headquarters are EIGRP neighbors.
We have very large routing tables because we are not summarizing and I was wondering the following.
1- Can I just advertise an EIGRP summary address on each VPN router tunnel interface? In the attached example, can I advertise a summary of 10.0.0.0/22 on each branch VPN router tunnel interface and a summary of 192.168.0.0/22 on the HQ VPN router tunnel interfaces? Someone once told me that this could not be done unless there was a direct cable connection between the VPN routers. I would think just being EIGRP neighbors would be enough, no?
2- For the branches, how would it be best to do stub routing? Would I configure that just on the Layer-3 switch in the branch or would I also do this on the VPN routers?
My end goal is to implement summarization and possibly stub routing to shrink my routing tables and improve performance.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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