/31 Subnet – http://www.ietf.org/rfc/rfc3021.txt So I’m working with GNS3 trying to perfect my BGP skills and decided to advertise a network of 210.69.1.1/24 which existed on my loopback 10 interface. For filtering purposes I needed a longer prefix to appear in the BGP table and I decided to change the mask to /30, but as i was … More The /31 Subnet