Datasheet

Data Sheet
© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 6 of 12
Availability and Scalability
Superior redundancy for
fault backup
●
Cisco UplinkFast and BackboneFast technologies help 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 the 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.
●
Command-switch redundancy enabled in Cisco Network Assistant software allows
designation of a backup command switch that takes over if the primary command switch fails.
●
Unidirectional Link Detection Protocol (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 reenable a link that is disabled
because of a network error.
●
Bandwidth aggregation up to 8 Gbps through Cisco Gigabit EtherChannel technology and up
to 800 Mbps through Cisco Fast 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 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.
●
VTP pruning limits bandwidth consumption on VTP trunks by flooding broadcast traffic only on
trunk links required to reach the destination devices.
●
IGMP Version 3 snooping provides fast client joins and leaves of multicast streams and limits
bandwidth-intensive video traffic to only the requestors. [[already said; decide which section
you want this in and put it only there; same with other repetitious bullets]]
●
IGMP filtering provides multicast authentication by filtering out no subscribers and limits the
number of concurrent multicast streams available per port.
QoS and Control
Advanced QoS
●
Standard 802.1p CoS field classification is provided.
●
Four egress queues per port enable differentiated management of up to four traffic types.
●
SRR scheduling ensures differential prioritization of packet flows by intelligently servicing the
ingress and egress queues.
●
Weighted Tail Drop (WTD) provides congestion avoidance at the ingress and egress queues
before a disruption occurs.
●
Strict Priority Queuing guarantees that the highest-priority packets are serviced ahead of all
other traffic.