Virtual Switching System: VSS is a virtualization network system technology pooling several Cisco Catalyst 6500 Series switches into one virtual switch, improving operational performance, enhancing nonstop communications and scaling system bandwidth capability to 1.4 Tbps. Learn more on WS-C3750X-48T-S. A VSS will allow two physical Cisco 6500 Series catalysts at the initial phase. The VSS shall be composed of:
VSS members: Cisco Catalyst 6500 Series Switches (up to two initially released switches) deployed with the 720 10GE Virtual Switching Supervisor
Virtual Switch Link (VSL): 10 Gigabit Ethernet connections between members (up to eight using EtherChannel);
One or more of the modules have to be the 10 Gigabit Ethernet connections: Switch Supervisor 720 10GE: 10 Gigabit Ethernet uplink ports
By combining network and system replication into a single node, VSS enables unparalleled flexibility and usability of the campus network. Cisco is certified architecture. It is verified and accredited by Cisco Safe Harbor programme. It lets us go
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VSS1440 refers to the VSS formed by two Cisco Catalyst 6500 Series Switches with the Switching Supervisor 720-10GE. In the VSS, the 720 Gbps supervisor engine data plane and switch fabric in each chassis are simultaneously active on both chassis, combining the active 1400-Gbps switching capacity per VSS. Only one of the leaders of the Virtual Turn has the active control plane. Both chassis are kept in line with the Stateful Switchover (SSO) interchassis mechanism along with Nonstop Forwarding (NSF) to provide nonstop contact even in the event of one of the member supervisor engines failing.
Stateful Mechanism SwitchOver(SSO):
A VSS uses NSF / SSO interchassis as the primary high-availability mechanism between the two chassis. One virtual switch member chassis will act as the active virtual switch member while the other member for the control plane will be in hot standby state. Note that both chassis’ data planes are active and, hence, forward traffic at full 1440 Gbps combined capacity. When one of the members of the virtual switch fails, there is no protocol reconvergence in the network. Access layer or core layer switches continue to forward traffic, as they only detect a link failure in an EtherChannel bundle and therefore no protocols need to be reconverted. There is no disruption to the traffic flowing via the VSS. During switch failure the VSS mechanism is far superior as compared to the traditional model where one switch failure results in indeterministic convergence of multiple control protocols such as STP, HSRP and routing protocol.
Ether channel multichassis (MEC):
Multichassis EtherChannel (MEC) is a multipathing system from the Layer 2. This type of EtherChannel allows a connected node to terminate the EtherChannel over the two physical Cisco Catalyst 6500 Series switches that make up the VSS, resulting in a simplified loop-free topology of the Layer 2 network. The use of MEC in VSS topology results in all links being active, while providing for a highly available topology without Spanning Tree Protocol dependence. The computer switching system supports a maximum number of 512 MECs, with the implementation of 12.2(33)SXI.