Encryption can be combined with L2F or L2TP over VPNs and VPDNs to further secure traffic across the Internet, which can be particularly vulnerable to attacks. Scalability features in software can complement the more expensive hardware enhancements, performing critical services such as bandwidth optimization and traffic management. Cisco IOS network services redefine scalability to extend beyond greater bandwidth and port density. NetFlow TM Switching and Tag Switching capabilities increase performance in Cisco switches and routers. Tag Switching acts like a postal code to bypass conventional packet-processing across router hops and to speed delivery across very large networks such as the Internet.
Intermediate routers read only the tags and send packets to the next router hop.
The destination router strips the tag and delivers the original packet to its end station or server. By definition, mission-critical applications are vital to business. Network downtime can cost millions of dollars per hour in lost revenue. A reliable network starts with a good design that includes redundant systems and links. These protocols communicate between router or ATM switch groups to detect device failures and initiate automatic reroutes that are configurable to less than one second failover.