Product specifications

Data Sheet
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 5 of 22
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Automatic QoS (AutoQoS) simplifies QoS configuration in voice over IP (VoIP) networks by
issuing interface and global switch commands to detect Cisco IP phones, classify traffic,
and help enable egress queue configuration.
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Master configuration management helps ensure that all switches are automatically
upgraded when the master switch receives a new software version. Automatic software
version checking and updating help ensure that all stack members have the same software
version.
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Autonegotiation on all ports automatically selects half- or full-duplex transmission mode to
optimize bandwidth.
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Dynamic Trunking Protocol (DTP) facilitates dynamic trunk configuration across all switch
ports.
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Port Aggregation Protocol (PAgP) automates the creation of Cisco Fast EtherChannel
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groups or Gigabit EtherChannel groups to link to another switch, router, or server.
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Link Aggregation Control Protocol (LACP) allows the creation of Ethernet channeling with
devices that conform to IEEE 802.3ad. This feature is similar to Cisco EtherChannel
technology and PAgP.
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Automatic media-dependent interface crossover (MDIX) automatically adjusts transmit and
receive pairs if an incorrect cable type (crossover or straight-through) is installed.
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Unidirectional Link Detection Protocol (UDLD) and Aggressive UDLD allow unidirectional
links caused by incorrect fiber-optic wiring or port faults to be detected and disabled on
fiber-optic interfaces.
High Availability
The Cisco Catalyst 3750-E Series increases availability for stackable switches. Each switch can
operate both as master controller and as forwarding processor. Each switch in the stack can serve
as a master, creating a 1:N availability scheme for network control. In the unlikely event of a single
unit failure, all other units continue to forward traffic and maintain operation.
Other high-availability features include but are not limited to:
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Cross-Stack EtherChannel provides the ability to configure Cisco EtherChannel technology
across different members of the stack for high resiliency.
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Flexlink provides link redundancy with convergence time less than 100 ms.
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IEEE 802.1s/w Rapid Spanning Tree Protocol (RSTP) and Multiple Spanning Tree Protocol
(MSTP) provide rapid spanning-tree convergence independent of spanning-tree timers and
also offers the benefit of Layer 2 load balancing and distributed processing. Stacked units
behave as a single spanning-tree node.
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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.
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Cisco Hot Standby Router Protocol (HSRP) is supported to create redundant, failsafe
routing topologies.
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Switch-port autorecovery (Errdisable) automatically attempts to reactivate a link that is
disabled because of a network error.