Data Sheet

Data Sheet
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Enhanced Hardware Features
The Cisco Catalyst 2955 Switch has been designed for deployment in harsh environments.
Through the use of special thermal design techniques and industrial-rated components, the
Cisco Catalyst 2955 is rated to operate at extreme temperatures (-40° to 60° C; -40° to 140° F).
Robust mechanical specifications allow for its deployment as a mobile platform and under extreme
vibration and shock environments (50G trapezoidal shock pulse). The compact form factor, DIN rail
mounting, and dual cabling orientations facilitate its deployment into industrial enclosures, traffic
control cabinets, and transportation vehicles. Two normally open relays can be associated with the
different port alarms, power alarms, and high temperature conditions to send an output signal to
other external mechanisms (visible or audible alarms, for example), HMIs, or PLCs for a controlled
shutdown. Dual power inputs provide for optional redundant power supplies, guaranteeing an even
higher level of resiliency and reliability.
Figure 1. Cisco Catalyst 2955 Series Switches
Table 1. Product Features and Benefits
Feature
Benefit
Availability
Superior redundancy for fault
backup
●
IEEE 802.1D Spanning-Tree Protocol support for redundant backbone
connections and loop-free networks simplifies network configuration and
improves fault tolerance.
●
Support for Cisco Spanning-Tree Protocol enhancements such as UplinkFast,
BackboneFast, and PortFast technologies helps ensure quick failover
recovery, enhancing overall network stability and availability.
●
IEEE 802.1w Rapid Spanning-Tree Protocol (RSTP) provides rapid
convergence of the spanning tree, 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.
●
Provides unidirectional link detection (UDLD) and Aggressive UDLD for
detecting and disabling unidirectional links on fiber-optic interfaces caused
by incorrect fiber-optic wiring or port faults.
Integrated Cisco IOS Software
features for bandwidth optimization
●
Bandwidth aggregation of up to 4 Gbps (two ports full duplex) through Cisco
Gigabit EtherChannel
®
technology and up to 1.6 Gbps (eight ports full duplex)
through Fast EtherChannel technology enhances fault tolerance and offers
higher-speed aggregated bandwidth between switches, to routers and
individual servers. Port Aggregation Protocol (PAgP) is available to simplify
configuration.
●
VLAN1 minimization allows VLAN1 to be disabled on any individual VLAN
trunk link.
●
Per-port broadcast, multicast, and unicast storm control prevents faulty end
stations from degrading overall system performance.
●
Per virtual LAN (VLAN) Spanning Tree Plus (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