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Availability/Scalability
Superior redundancy
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 provides rapid spanning-tree convergence
(independent of spanning-tree timers) and benefit of distributed processing.
• Per-VLAN Rapid Spanning Tree Plus (PVRST+) allows rapid spanning-tree reconvergence
on a per-VLAN spanning-tree basis, without requiring the implementation of
spanning-tree instances.
• Unidirectional link detection (UDLD) and aggressive UDLD allow unidirectional links
caused by incorrect fiber-optic wiring or port faults to be detected and disabled on
fiber-optic interfaces.
• Switch port autorecovery (errdisable) automatically attempts to re-enable a link that is
disabled due to a network error.
• Cisco Redundant Power System (RPS) 675 support provides superior power-source
redundancy for up to six Cisco networking devices, resulting in improved fault tolerance
and network uptime.
• Bandwidth aggregation up to 8 Gbps through Gigabit EtherChannel technology and up
to 800 Mbps through Fast EtherChannel technology enhances fault tolerance and offers
higher-speed aggregated bandwidth between switches and to routers and individual
servers.
Integrated Cisco
Catalyst OS Software
features for
bandwidth
optimization
• 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 allows multiple VLANs to share a
spanning-tree instance, enabling Layer 2 load sharing on redundant links.
• Local Proxy Address Resolution Protocol (ARP) works in conjunction with Private VLAN
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.
Quality of Service (QoS)/Control
QoS and rate limiting • 802.1p class of service (CoS) field classification is provided, using marking and
reclassification on a per-packet basis.
• Two egress queues per port applied at a system level enable differentiated management
of up to two traffic types.
Table 1 Product Features and Benefits (Continued)
Feature Benefit
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