Cisco 2950SX 24 - Catalyst Switch - Stackable Manual de usuario descargar pdf (Pagina 8)

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Service Breadth

Resiliency and reliability

(continued)

• Cisco CrossStack UplinkFast (CSUF) technology provides increased

redundancy and network resiliency through fast spanning-tree convergence

(less than two seconds) across a stack of switches using Cisco 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.

• BPDU guard shuts down STP PortFast-enabled interfaces when BPDUs are

received to avoid accidental spanning tree topology changes.

• STRG prevents edge devices not in the network administrator'scontrol 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 Cisco’s optional RPS 300 Redundant Power System provides

superior internal power source redundancy for up to six Cisco networking

devices, resulting in improved fault tolerance and network uptime.

Redundancy • Bandwidth aggregation up to 4 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.

• IEEE 802.1D STP 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

utilize the extra capacity inherent in a redundant design.

• VLAN Trunking Protocol (VTP) pruning limits bandwidth consumption on

VTP trunks by ﬂooding broadcast trafﬁc onlyon trunk links required to reach

the destination devices.

Scalability • CWDM GBIC solution support allows for the scaling of bandwidth without

deploying additional ﬁber. It provides scalability of up to eight Gigabits of

bandwidth on a pair of single-mode ﬁbers to reach distances up to 100–120

km.

• Support for up to 4096 VLAN Ids with 250 active VLANs per switch, and up

to 64 spanning tree instances per switch.

Feature Benefit

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