Intelligent Layer 2 Availability and Scalability
The Cisco Catalyst 2960 LAN Lite Series is equipped with a robust set of features that allow for network scalability
and higher availability with a complete suite of Layer 2 protocols including Spanning Tree Protocol enhancements
aimed maximizing availability in a Layer 2 network.
Enhancements to the standard Spanning Tree Protocol, such as Per-VLAN Spanning Tree Plus (PVST+), Uplink
Fast, and PortFast, maximize network uptime. PVST+ allows for Layer 2 load sharing on redundant links to efficiently
use the extra capacity inherent in a redundant design. Uplink Fast, PortFast, and BackboneFast all greatly reduce
the standard 30- to 60-second Spanning Tree Protocol convergence time. Loop guard and bridge-protocol-data-unit
(BPDU) guard provide Spanning Tree Protocol loop avoidance.
Superior redundancy features include:
Up to 64 VLANs per switch and up to 64 spanning-tree instances per switch are supported.
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Cisco Uplink Fast and BackboneFast technologies help ensure quick failover recovery, enhancing overall
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network stability and reliability.
Per-VLAN Rapid Spanning Tree Plus (PVRST+) allows rapid spanning-tree reconvergence on a per-VLAN
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spanning-tree basis, without requiring the implementation of spanning-tree instances.
IEEE 802.1d Spanning Tree Protocol support for redundant backbone connections and loop-free networks
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simplifies network configuration and improves fault tolerance.
IEEE 802.1s Multiple Spanning Tree Protocol (MSTP) allows a spanning-tree instance per VLAN, enabling
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Layer 2 load sharing on redundant links.
IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) provides rapid spanning-tree convergence
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independent of spanning-tree timers and the benefit of distributed processing.
Cisco EtherChannel bandwidth aggregation enhances fault tolerance and offers higher-speed aggregated
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bandwidth .
Unidirectional Link Detection Protocol (UDLD) and Aggressive UDLD allow unidirectional links to be
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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
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a network error.
The following tables starting with Table 2 provide both hardware and software details about the Cisco Catalyst 2960
LAN Lite Switches.
Table 2.
Description
Performance
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Catalyst 2960 LAN Lite Series Switch Hardware
Specification
Forwarding Bandwidth
Flash memory
Memory DRAM
Max VLANs
VLAN IDs
Maximum transmission unit (MTU)
Jumbo frames
Forwarding rate
2960-8TC-S
2960-24-S
2960-24TC-S
2960-24PC-S
16 Gbps
32 MB
64MB
64
4K
Up to 9,000 bytes
9,016 bytes
2.7 Mpps
3.6 Mpps
6.5 Mpps
6.5 Mpps
Data Sheet
Page 6 of 14
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