The Router MC supports )only specific tunneling technologies. The tunneling technologies supported are IPSec, IPSec with GRE, and IPSec with GRE over Frame Relay.
Differences Between IPSec and IPSec with GREBesides only supporting IP traffic, there are some key differences between IPSec tunnels and IPSec with GRE tunnels. IPSec-only tunnels support dynamic tunneling in addition to providing finer traffic granularity through extended ACLs. However, IPSec with GRE tunnels support spoke-to-spoke connectivity and higher tunnel resilience through the use of routing protocols. |