![]() ![]() All control plane functions are centrally managed by the SV active switch, including: Within a StackWise Virtual domain, one device is designated as the SV active switch, and the other is designated as the SV standby switch (Figure 3). To neighboring devices, a StackWise Virtual domain appears as a single logical switch or router. It uses Cisco IOS ® Stateful Switchover (SSO) technology, as well as Non-Stop Forwarding (NSF) extensions to routing protocols, to provide seamless traffic failover when one of the device fails over. StackWise Virtual (SV) combines two switches into a single logical network entity from the network control plane and management perspectives. The StackWise Virtual domain is supported with specific hardware and software components, which are described later in this white paper After the reload, both devices come back online as StackWise Virtual Pair. The conversion is a one-time process that requires a few simple configuration steps and a system reload. Simplified management of a single configuration and fewer operational failure pointsįigure 2 graphically represents the benefits of transitioning from traditional architecture to StackWise Virtual Architecture.Ī StackWise Virtual domain is created by converting two standalone Cisco Catalyst 9000 switches to a single logical network entity.Reduced configuration errors and elimination of First Hop Redundancy Protocols (FHRP), such as Hot Standby Routing Protocol (HSRP), GLBP and VRRP.Better return on existing investments via increased bandwidth from access layer. ![]() Non-stop business communication through the use of a redundant chassis with SSO-enabled supervisors.Reduced risk associated with a looped topology.Key business benefits of the SVL include the following: In addition, StackWise Virtual also incorporates many other Cisco innovations-such as Stateful Switch Over (SSO), Non-Stop Forwarding (NSF) and Multi-chassis EtherChannel (MEC)-that enable non-stop communication with increased bandwidth to substantially enhance application response time Thus, the spanning-tree domain treats the StackWise Virtual pair as one bridge node instead of two. One of the most significant changes is that StackWise Virtual enables the creation of a loop-free topology because the two switches operate as one. This virtualization of the two-physical switches into single logical switch fundamentally alters the design of campus topology. This paper explains the Cisco StackWise Virtual technology, including its benefits and requirements.Ĭisco Catalyst 9000 platform StackWise Virtual: An overview StackWise Virtual physical to logical representation ![]()
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