GRE Tunnels are just encapsulation technique being used to transmit your data over public network.
For an example if you private subnet being used in your local lan in your locations and if you want to have them communicate with each other over a public network then you just need to configure GRE tunnels between the locations over ther public network and have the communication established between your locations.
you can also refer the below link for more info on the same..
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...