Today I was configuring a summary route between two routers and I had a strange problem:
On R5 i wanted to configure a summary route for addresses 126.96.36.199, 188.8.131.52, 184.108.40.206 etc and send this route over to R8.
ip summary-address rip 220.127.116.11 255.255.255.248
That should do it right?
So I did, and to my astonishment R8 got the summary PLUS all the /32 routes.
After 15 minutes of troubleshooting and cursing at GNS3 I realized what was happening. It was well after 11p.m. and I couldn’t see the fact that instead of creating a summary route 18.104.22.168 255.255.248.0, I created one for 255.255.255.248.
When you’re tired, doublecheck all the numbers. Tiredness is very much like being drunk. Being tired can cause serious network outages.