Vlan Features - Cisco Catalyst 2975 Software Configuration Manual

Features
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VLAN Features

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Security Features
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Catalyst 2975 Switch Software Configuration Guide
1-8
Flex Link Layer 2 interfaces to back up one another as an alternative to STP for basic link
redundancy
Link-state tracking to mirror the state of the ports that carry upstream traffic from connected hosts
and servers, and to allow the failover of the server traffic to an operational link on another Cisco
Ethernet switch.
Support for up to 255 VLANs for assigning users to VLANs associated with appropriate network
resources, traffic patterns, and bandwidth
Support for VLAN IDs in the 1 to 4094 range as allowed by the IEEE 802.1Q standard
VLAN Query Protocol (VQP) for dynamic VLAN membership
IEEE 802.1Q trunking encapsulation on all ports for network moves, adds, and changes;
management and control of broadcast and multicast traffic; and network security by establishing
VLAN groups for high-security users and network resources
Dynamic Trunking Protocol (DTP) for negotiating trunking on a link between two devices and for
negotiating the type of trunking encapsulation (IEEE 802.1Q) to be used
VLAN Trunking Protocol (VTP) and VTP pruning for reducing network traffic by restricting
flooded traffic to links destined for stations receiving the traffic
Voice VLAN for creating subnets for voice traffic from Cisco IP Phones
VLAN 1 minimization for reducing the risk of spanning-tree loops or storms by allowing VLAN 1
to be disabled on any individual VLAN trunk link. With this feature enabled, no user traffic is sent
or received on the trunk. The switch CPU continues to send and receive control protocol frames.
VLAN Flex Link Load Balancing to provide Layer 2 redundancy without requiring Spanning Tree
Protocol (STP). A pair of interfaces configured as primary and backup links can load balance traffic
based on VLAN.
Support for 802.1x authentication with restricted VLANs (also known as authentication failed
VLANs)
Support for VTP version 3 that includes support for configuring extended range VLANs (VLANs
1006 to 4094) in any VTP mode, enhanced authentication (hidden or secret passwords), propagation
of other databases in addition to VTP, VTP primary and secondary servers, and the option to turn
VTP on or off by port
IP Service Level Agreements (IP SLAs) responder support that allows the switch to be a target
device for IP SLAs active traffic monitoring
Web authentication to allow a supplicant (client) that does not support IEEE 802.1x functionality to
be authenticated using a web browser
Local web authentication banner so that a custom banner or an image file can be displayed at a web
authentication login screen
Password-protected access (read-only and read-write access) to management interfaces (device
manager, Network Assistant, and the CLI) for protection against unauthorized configuration
changes
Chapter 1 Overview
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