Virtual Switching System (VSS) is a network virtualization technology used in the LAN that allows two physical Cisco Catalyst 4500, 6500, or
6800 series switches to act as a single logical virtual switch. VSS allows for the creation of Layer 2 port channels from the third downstream
device to the pair of VSS switches, which eliminates STP blocking and allows for active/active forwarding. This technology is very similar to
Multichassis EtherChannel (MEC) used with the Cisco Catalyst 3850 series product line, which enables switches stacked together to operate with
a single control plane and use a single command-line interface (CLI) for management. However, VSS is limited to two physical chassis connected
together. Furthermore, with VSS there is no longer a need for first-hopredundancy protocols (FHRPs) such as HSRP and GLBP because both
switches share a single IP address for switched virtual interfaces (SVIs).
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Alex34
5 years, 10 months ago