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Коммутатор Cisco Catalyst WS-C2955T-12
Коммутатор Cisco Catalyst WS-C2955T-12
Нет в наличии
310.00 $ 18 135,00 P
Артикул: WS-C2955T-12
Промышленный коммутатор, L2, 12 портов 10/100BASE-T, 2 порта 10/100/1000BASE-T, разъём сигнала тревоги
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Product Features and Benefits





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 instance per VLAN, enabling Layer 2 load sharing on redundant links.
• 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. Dynamic Trunking Protocol (DTP) enables dynamic trunk configuration across all ports on the switch.
• Internet Group Management Protocol Version 3 (IGMPv3) snooping provides for fast client joins and leaves of multicast streams and limits bandwidth-intensive video traffic to only the requestors. Multicast VLAN Registration MVR, IGMP filtering, and fast-join and immediate leave are available as enhancements. The number of IGMP groups can be limited with IGMP throttling. IGMP Snooping time can be adjusted to optimize the performance of multicast data flows.
• MVR continuously sends multicast streams in a multicast VLAN while isolating the streams from subscriber VLANs for bandwidth and security reasons.
• Supports additional frame formats: Ethernet II (tagged and untagged), 802.3 (SNAP encapsulated, tagged and untagged frames).


Network Security Features

• Filtering of incoming traffic flows based on Layer 2, Layer 3, or Layer 4 ACPs prevents unauthorized data flows.
• The following Layer 2 ACPs or a combination can be used for security classification of incoming packets: source MAC address, destination MAC address, and 16-bit Ethertype.
• The following Layer 3 and Layer 4 fields or a combination can be used for security classification of incoming packets: source IP address, destination IP address, TCP source or destination port number, UDP source, or destination port number. ACLs can also be used to filter based on DSCP values.
• Time-based ACLs allow configuration of differentiated services based on time periods.
• Private VLAN edge provides security and isolation between ports on a switch, helping ensure that voice traffic travels directly from its entry point to the aggregation device through a virtual path and cannot be directed to a different port.
• Support for the 802.1x standard allows users to be authenticated, regardless of which LAN port they are accessing, and provides unique benefits to customers who have a large base of mobile (wireless) users accessing the network.
• IEEE 802.1x with VLAN assignment allows a dynamic VLAN assignment for a specific user, regardless of where the user is connected.
• IEEE 802.1x with voice VLAN gives an IP phone access to the voice VLAN, regardless of the authorized or unauthorized state of the port.
• IEEE 802.1x with port security authenticates the port and manages network access for all MAC addresses, including the clients'.
• IEEE 802.1x with guest VLAN allows guests without 802.1x clients to have limited network access on the guest VLAN.
• SSHv2 and SNMPv3 provide network security by encrypting administrator traffic during Telnet and SNMP sessions. SSHv2 and the crypto version of SNMPv3 require a special crypto software image because of U.S. export restrictions.
• Port Security and unicast MAC filtering secure the access to a port based on MAC addresses. The aging feature of port security removes the MAC address from the switch after a specific time frame to allow another device to connect to the same port. Unicast MAC filtering allows non-IP packets to be filtered as well.
• With unknown unicast/multicast port blocking, the switch will not flood packets with unknown destination MAC addresses to all Ethernet ports. Unknown unicast/multicast port blocking disables flooding on a per-port basis.
• MAC address notification allows administrators to be notified of new users added or removed from the network.
• Spanning-tree root guard (STRG) prevents edge devices not in the network administrator's control from becoming Spanning-Tree Protocol root nodes.
• The Spanning-Tree Protocol PortFast/bridge protocol data unit (BPDU) guard feature disables access ports with Spanning-Tree Protocol PortFast enabled upon reception of a BPDU, and increases network reliability, manageability, and security.
• Multilevel console access security prevents unauthorized users from altering the switch configuration.
• TACACS+ and RADIUS authentication enables centralized control of the switch and restricts unauthorized users from altering the configuration.
• The user-selectable address-learning mode simplifies configuration and enhances security.
• Trusted Boundary provides the ability to trust the QoS priority settings if a Cisco IP phone is present and to disable the trust setting if the IP phone is removed, preventing a rogue user from overriding prioritization policies in the network.
• IGMP Filtering provides multicast authentication by filtering out nonsubscribers and limits the number of concurrent multicast streams available per port.
• Support for dynamic VLAN assignment through implementation of VLAN Membership Policy Server (VMPS) client functionality provides flexibility in assigning ports to VLANs. Dynamic VLAN enables fast assignment of IP addresses.
• SPAN support of intrusion detection systems (IDSs) to monitor, repel, and report network security violations.
• Cisco Network Assistant software security wizards ease the deployment of security features for restricting user access to a server, a portion of the network, or the network.



• The switches support the aggregate QoS model by enabling classification, policing/metering, and marking functions on a per-port basis at ingress and queuing/scheduling functions at egress.
• The switches support configuring QoS ACPs on all ports, using ACPs to help ensure proper policing and marking on a per-packet basis. Up to four ACPs per switch are supported in configuring either QoS ACPs or security filters.
• Automatic QoS (Auto-QoS) greatly simplifies the configuration of QoS in voice-over-IP (VoIP) networks by issuing interface and global switch commands that allow the detection of Cisco IP phones, the classification of traffic, and egress queue configuration.

QoS Classification Support at Ingress

• The switches support QoS classification of incoming packets for QoS flows based on Layer 2, Layer 3, and Layer 4 fields.
• The following Layer 2 fields (or a combination) can be used for classifying incoming packets to define QoS flows: source/destination MAC address or 16-bit Ethertype.
• The switches support identification of traffic based on Layer 3 type of service (ToS) field DSCP values.
• The following Layer 3 and Layer 4 fields (or a combination) can be used to classify incoming packets to define QoS flows: source/destination IP address, TCP source/destination port number, or UDP source/destination port number.

QoS metering/policing at ingress

• Support for metering/policing of incoming packets restricts incoming traffic flows to a certain rate.
• The switches support up to six policers per Fast Ethernet port, and 60 policers on a Gigabit Ethernet port.
• The switches offer granularity of traffic flows at 1 Mbps on Fast Ethernet ports, and 8 Mbps on Gigabit Ethernet ports.

QoS marking at ingress

• The switches support marking and remarking packets based on the state of policers/meters.
• The switches support marking and remarking based on the following mappings: from DSCP to 802.1p, and from 802.1p to DSCP.
• The switches support 14 well-known and widely used DSCP values.
• The switches support classifying or reclassifying packets based on the default DSCP per port, and support classification based on DSCP values in the ACL.
• The switches support classifying or reclassifying frames based on the default 802.1p value per port.
• The switches support 802.1p override at ingress.

QoS scheduling support at egress

• Four queues per egress port are supported in hardware.
• The WRR queuing algorithm helps ensure that low-priority queues are not starved.
• Strict Priority Scheduling helps ensure that time-sensitive applications such as voice always follow an expedited path through the switch fabric.

Sophisticated traffic management

• The switch offers the ability to limit data flows based on MAC source or destination address, IP source or destination address, TCP/UDP port numbers, or any combination of these fields.
• The switch offers the ability to manage data flows asynchronously upstream and downstream from the end station or on the uplink.


Superior manageability

• An embedded Remote Monitoring (RMON) software agent supports four RMON groups (history, statistics, alarms, and events) for enhanced traffic management, monitoring, and analysis.
• The switch supports all nine RMON groups through the use of a Cisco SwitchProbe ® Analyzer Switched Port Analyzer (SPAN) port, permitting traffic monitoring of a single port, a group of ports, or the entire switch from a single network analyzer or RMON probe.
• A SPAN port monitors traffic of a single port from a single network analyzer or RMON probe.
• Remote SPAN (RSPAN) allows network administrators to locally monitor ports in a Layer 2 switch network from any other switch in the same network.
• DHCP Snooping Option 82 enables more sophisticated IP address assignment by the DHCP server.
• The Domain Name System (DNS) provides IP address resolution with user-defined device names.
• Trivial File Transfer Protocol (TFTP) reduces the cost of administering software upgrades by downloading from a centralized location.
• Network Timing Protocol (NTP) provides an accurate and consistent timestamp to all switches within the intranet.
• Layer 2 traceroute eases troubleshooting by identifying the physical path that a packet takes from the source device to a destination device.
• Crash Information Support enables the switch to generate a crash file for improved troubleshooting.
• Show Interface Capabilities provides information on the configuration capabilities of any interface.
• RTTMON-MIB allows users to monitor network performance between a Cisco Catalyst switch and a remote device.

Cisco Network Assistant software

• Cisco Network Assistant software is free, standalone network management application software that simplifies the administration of networks of up to 250 users. It supports a wide range of Cisco Catalyst intelligent switches from Cisco Catalyst 2940 through Cisco Catalyst 4506. With Cisco Network Assistant, users can manage Cisco Catalyst switches plus launch the device managers of Cisco integrated services routers (ISRs) and Cisco Aironet ® WLAN access points by simply clicking their icon in the topology map.
• Cisco AVVID wizards use just a few user inputs to automatically configure the switch to optimally handle different types of traffic: voice, video, multicast, and/or high-priority data.
• A security wizard is provided to restrict unauthorized access to servers and networks and to restrict certain applications on the network.
• One-click software upgrades can be performed across multiple switches simultaneously, and configuration cloning enables rapid deployment of networks.
• Cisco Network Assistant software supports multilayer feature configurations such as ACPs and QoS parameters.
• Cisco Network Assistant Software Guide Mode assists users in the configuration of powerful advanced features by providing step-by-step instructions.
• Cisco Network Assistant software provides enhanced online help for context-sensitive assistance.
• Easy-to-use GUI provides both a topology map and front-panel view of the switches.
• Multidevice and multiport configuration capabilities allow network administrators to save time by configuring features across multiple switches and ports simultaneously.
• User-personalized interface allows users to modify polling intervals, table views, and other settings within Cisco Network Assistant software and to retain these settings the next time they use Cisco Network Assistant.
• Alarm notification provides automated e-mail notification of network errors and alarm thresholds.

Support for CiscoWorks

• Manageable through CiscoWorks network management software on a per-port and per-switch basis, providing a common management interface for Cisco routers, switches, and hubs.
• SNMPv1, v2, and v3 (non-crypto) and Telnet interface support deliver comprehensive in-band management, and a CLI-based management console provides detailed out-of-band management.
• Cisco Discovery Protocol versions 1 and 2 enable a CiscoWorks network management station to automatically discover the switch in a network topology.
• CiscoWorks is supported by the CiscoWorks 2000 LAN Management Solution.

Ease of use and ease of deployment

• Cisco Device Manager is embedded Web-based software that allows the customer to easily configure and troubleshoot the switch, eliminating the need for more complex terminal emulation programs and CLI knowledge, and reducing the cost of deployment by enabling less-skilled personnel to quickly and simply set up switches.
• Smartports offers a set of verified feature macros per connection type in an easy-to-apply manner. With these macros, users can consistently and reliably configure essential security, availability, quality of service, and manageability features recommended for Cisco Business-Ready Campus solutions with minimal effort and expertise.
• Autoconfiguration eases the deployment of switches in the network by automatically configuring multiple switches across a network via a boot server.
• Autosensing on each Ethernet port] detects the speed of the attached device and automatically configures the port for 10-, 100-, or 1000-Mbps operation, easing the deployment of the switch in mixed 10, 100, and 1000BASE-T environments.
• Autonegotiating on all ports automatically selects half- or full-duplex transmission mode to optimize bandwidth.
• Cisco VTP supports dynamic VLANs and dynamic trunk configuration across all switches.
• DTP enables dynamic trunk configuration across all ports in the switch.
• Voice VLAN simplifies telephony installations by keeping voice traffic on a separate VLAN for easier network administration and troubleshooting.
• Dynamic Trunking Protocol (DTP) enables dynamic trunk configuration across all ports on the switch.
• PAgP automates the creation of Cisco Fast EtherChannel or Gigabit EtherChannel groups, enabling linking to another switch, router, or server.
• Link Aggregation Control Protocol (LACP) allows the creation of Ethernet channeling with devices that conform to IEEE 802.3ad. This is similar to Cisco EtherChannel and PAgP.
• The default configuration stored in Flash helps ensure that the switch can be quickly connected to the network and can pass traffic with minimal user intervention.

Product Specifications





• 13.6 Gbps switching fabric
• Cisco Catalyst 2955T-12: 6.4 Gbps maximum forwarding bandwidth
• Cisco Catalyst 2955C-12: 2.8 Gbps maximum forwarding bandwidth
• Cisco Catalyst 2955S-12: 2.8 Gbps maximum forwarding bandwidth
• (Forwarding rates based on 64-byte packets)
• Cisco Catalyst 2955T-12: 4.8 Mpps wire speed forwarding rate
• Cisco Catalyst 2955C-12: 2.0 Mpps wire speed forwarding rate
• Cisco Catalyst 2955S-12: 2.0 Mpps wire speed forwarding rate
• 8 MB memory architecture shared by all ports
• Up to 32 MB SDRAM and 16 MB Flash memory
• Configurable up to 8000 MAC addresses


• RFC1213-MIB
• RFC1398-MIB


• IEEE 802.1x support
• IEEE 802.1w Rapid Spanning Tree Protocol (RSTP)
• IEEE 802.1s Multiple Spanning Tree Protocol (MSTP)
• IEEE 802.3x full duplex on 10BASE-T, 100BASE-TX, and 1000BASE-T ports
• IEEE 802.1D Spanning-Tree Protocol
• IEEE 802.1p CoS prioritization
• IEEE 802.1Q VLAN
• IEEE 802.3 10BASE-T specification
• IEEE 802.3u 100BASE-TX specification
• IEEE 802.3ab 1000BASE-T specification
• IEEE 802.3ad Link Aggregation Control Protocol (LACP)
• IEEE 802.3ah Ethernet in the First Mile (EFM)
• RMON I and II standards
• SNMPv1, SNMPv2c, and SNMPv3

Connectors and cabling

• 10BASE-T/100BASE-TX ports: RJ-45 connectors; four-pair Category 5 UTP cabling
• 1000BASE-T ports: RJ-45 connectors; four-pair Category 5 UTP cabling
• 100BASE-FX ports: MT-RJ connectors; 50/125 or 62.5/125 micron multimode fiber-optic cabling
• 100BASE-LX ports: LC connectors; 9/125 micron single-mode fiber-optic cabling
• Management console port: 8-pin RJ-45 connector, RJ-45-to-RJ-45 rollover cable with RJ-45-to-DB9 adapter for PC connections; for terminal connections, use RJ-45-to-DB25 female data-terminal-equipment (DTE) adapter (can be ordered separately from Cisco, part number ACS-DSBUASYN=)

MT-RJ patch cables for Cisco Catalyst 2955

Type of cable, Cisco part number

• One-meter, MT-RJ-to-SC multimode cable, CAB-MTRJ-SC-MM-1M **
• Three-meter, MT-RJ-to-SC multimode cable, CAB-MTRJ-SC-MM-3M
• Five-meter, MT-RJ-to-SC multimode cable, CAB-MTRJ-SC-MM-5M
• One-meter, MT-RJ-to-ST multimode cable, CAB-MTRJ-ST-MM-1M
• Three-meter, MT-RJ-to-ST multimode cable, CAB-MTRJ-ST-MM-3M
• Five-meter, MT-RJ-to-ST multimode cable, CAB-MTRJ-ST-MM-5M
• Two-meter, LC to SC single-mode cable, CAB-CP-LCSC-2M
** The port on the switch is a receptacle (female) it requires a cable with male plug connector with two pin holes on it.


• Per-port status LEDs: Link integrity, disabled, activity, and indications
• Dual-power-supply indicators
• Major and minor alarm-relay indicators

Dimensions and weight (HxWxD)

• 3.78x8.07x5.03 in. (9.60x20.50x12.78 cm): Connectors facing forward
• 5.03x8.07x3.78 in. (12.78x20.50x9.60 cm): Connectors facing downward
• 3.0 lb (1.4 kg)

Relay contacts

• Surge withstand between open contacts: 1500V, FCC Part 68
• Surge withstand between contact and coil: 2500V, Bellcore
• Maximum switching capacity: 1A @ 30 VDC
• Maximum switching voltage: .3A @ 125 VAC

Environmental ranges

• Recommended operating temperature range: -40° to 140° F (-40° to 60° C)
• Recommended storage temperature range: -40° to 185° F (-40° to 85° C)
• Operating relative humidity: 10 to 95% (noncondensing)


Cisco Catalyst 2955 - серия коммутаторов промышленного класса, способных работать в жестких условиях эксплуатации. Коммутаторы Catalyst 2955 могут применяться на промышленных предприятиях, в транспортных системах, а также во многих других областях, где условия эксплуатации не позволяют применять стандартные коммутаторы.
Основные особенности:
  • Прочность: коммутаторы отличаются компонентами промышленного класса, компактными размерами, конвекционным охлаждением и релейной аварийной сигнализацией. Разработаны для эксплуатации при экстремальных температурах (от -40 до 60 °C), относительной влажности (до 95% без конденсации), ударных нагрузках (до 50G при трапециевидном ударном импульсе) и вибрациях (до 500 Гц).
  • Развитые средства качества обслуживания (QoS): поддержка агрегированной модели QoS (классификация, полисинг и маркирование на входе и очередность на выходе). Классификация трафика по полям DSCP или 802. 1p (CoS), а также по исходным и конечным MAC, IP адресам или портам TCP/UDP, приоритетная и взвешенная круговая обработка очередей, 4 очереди на порт, AutoQoS.
  • Высокая доступность: резервирование управляющего коммутатора позволяет повысить доступность кластера, функции обнаружения и блокировки неисправных портов и линий связи UDLD и Aggressive UDLD. Для эффективного использования ресурсов приложениями, применяющими многоадресную рассылку (multicast), Catalyst 2955 имеют аппаратную реализацию IGMP snooping. Помимо стандартного протокола Spanning Tree поддерживаются дополнительные функции, оптимизирующие его работу, - UplinkFast, PortFast, BackboneFast, также поддерживаются Per-VLAN Spanning Tree, 802. 1w и др.
  • Широкие возможности в области безопасности: поддерживаются фильтрация трафика с помощью списков доступа (ACL) на 2, 3 и 4 уровнях, а также, в зависимости от времени, протокол 802.1x, функциональность Identity-Based Networking Services (IBNS), Private VLAN Edge, Port Security, IGMP Filtering, динамическое назначение VLAN и др. Для обеспечения безопасности при администрировании поддерживаются протоколы SSH, SNMPv3, а также централизованная аутентификация на серверах TACACS+ и RADIUS.
  • Отличная управляемость: встроенный агент RMON, порт SPAN, Remote SPAN, DNS, TFTP, поддержка протокола NTP, L2 traceroute, многофункциональные светодиоды портов. Поддержка ПО Cisco CMS, CiscoWorks, протоколов SNMP версий 1, 2, 3.
В комплект входит:
- коммутатор б.у., тщательно протестированный, гарантия 3 месяца
- упаковка
Коммутатор Cisco Catalyst WS-C2955T-12
Артикул: WS-C2955T-12
товар в корзине, оформить?
310.00 $ 18 135,00 P
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