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Availability and Scalability
SuperiorRedundancy
for Fault Backup
• Cisco UplinkFast and BackboneFast technologies help to ensure quick failover recovery,
enhancing overall network stability and reliability.
• IEEE 802.1w Rapid Spanning-Tree Protocol (RSTP) provides rapid spanning-tree
convergence independent of spanning-tree timers.
• Per-VLAN Rapid Spanning-Tree (PVRST+) allows rapid spanning-tree reconvergence on
a per-VLAN spanning-tree basis, without requiring the implementation of spanning-tree
instances.
• Command-switch redundancy enabled in Cisco CMS Software allows designation of a
backup command switch that takes over cluster management functions if the primary
command switch fails.
• Unidirectional Link Detection (UDLD) and Aggressive UDLD allow unidirectional links to
be detected and disabled to avoid problems such as spanning-tree loops.
• Switch port autorecovery (errdisable) automatically attempts to re-enable a link that is
disabled due to a network error.
• Cisco RPS 675 support provides superior power-source redundancy for up to 6 Cisco
networking devices, resulting in improved fault tolerance and network uptime.
• Bandwidth aggregation of up to 8 Gbps through Gigabit EtherChannel technology
enhances fault tolerance and offers higher-speed aggregated bandwidth between
switches, and to routers and individual servers. Integrated Cisco IOS Software features
for bandwidth optimization
• Per-port broadcast, multicast, and unicast storm control prevents faulty end stations from
degrading overall systems performance.
• IEEE 802.1d Spanning-Tree Protocol support for redundant backbone connections and
loop-free networks simplifies network configuration and improves fault tolerance.
• PVST+ allows for Layer 2 load sharing on redundant links to efficiently use the extra
capacity inherent in a redundant design.
• IEEE 802.1s Multiple Spanning-Tree Protocol (MSTP) allows a spanning-tree instance per
VLAN, enabling Layer 2 load sharing on redundant links.
• Local Proxy Address Resolution Protocol (ARP) works in conjunction with Private VLAN
Edge to minimize broadcasts and maximize available bandwidth.
• VLAN1 minimization allows VLAN1 to be disabled on any individual VLAN trunk link.
• VLAN Trunking Protocol (VTP) pruning limits bandwidth consumption on VTP trunks by
flooding broadcast traffic only on trunk links required to reach the destination devices.
• Internet Group Management Protocol (IGMP) snooping provides fast client joins and
leaves of multicast streams and limits bandwidth-intensive video traffic to only the
requestors.
• Multicast VLAN Registration (MVR) continuously sends multicast streams in a multicast
VLAN while isolating the streams from subscriber VLANs for bandwidth and security
reasons.
Table 1 Product Features and Benefits (Continued)
Feature Benefit