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Resiliency and reliability • IEEE 802.1w Rapid Spanning Tree (RSTP) takes advantage of point-to-point
wiring and provides rapid convergence of the spanning tree independent of
spanning-tree timers. Reconfiguration of the spanning tree can occur in less
than one second, which is critical for metro networks carrying
mission-critical and delay-sensitive traffic such as enterprise data, voice,
and video.
• IEEE 802.1s Multiple Spanning Tree (MSTP), which uses RSTP for rapid
convergence, enables VLANs to be grouped into a spanning-tree instance,
with each instance having a spanning-tree topology independent of other
spanning-tree instances. This architecture provides for multiple forwarding
paths for data traffic, enables load balancing, and reduces the number of
spanning-tree instances required to support a large number of VLANs.
• Cisco UplinkFast/BackboneFast technologies ensure quick failover recovery,
enhancing overall network stability and reliability.
• Cisco CrossStack UplinkFast (CSUF) technology provides increased
redundancy and network resiliency through fast spanning-tree convergence
(fewer than two seconds) across a stack of switches using GigaStack GBICs
in an independent stack backplane cascaded configuration.
• Redundant stacking connections provide support for a redundant loopback
connection for top and bottom switches in an independent stack backplane
cascaded configuration.
• Bridge protocol data unit (BPDU) guard shuts down Spanning-Tree Protocol
PortFast-enabled interfaces when BPDUs are received to avoid accidental
spanning-tree topology changes.
• Spanning-tree root guard prevents edge devices outside the network
administrator’s control from becoming STP root nodes.
• Command switch redundancy enabled in the Cisco Cluster Management
Suite (CMS) Software allows customers to designate a backup command
switch that takes over cluster management functions if the primary
command switch fails.
• Unidirectional link detection (UDLD) detects and disables unidirectional
links on fiber-optic interfaces caused by incorrect fiber-optic wiring or port
faults. Aggressive UDLD allows precautionary disabling of port on
bidirectional links.
• Per-port broadcast, multicast, and unicast storm control prevents faulty
end-stations from degrading overall systems performance.
• Support for (Redundant Power System) 300 (RPS 300) that provides
superior internal power source redundancy for up to six Cisco networking
devices resulting in improved fault tolerance and network uptime.
Redundancy • Bandwidth aggregation of up to 16 Gbps through Cisco Gigabit
EtherChannel technology and up to 1.6 Gbps through Cisco Fast
EtherChannel technology enhances fault tolerance and offers higher-speed
aggregated bandwidth between switches, to routers and individual servers.
• Supports Cisco HSRP to create redundant failsafe routing topologies.
• IEEE 802.1D Spanning Tree Protocol support for redundant backbone
connections and loop-free networks simplifies network configuration and
improves fault tolerance.
Feature Benefit
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