Vlan Features - Cisco IE-3000-8TC Software Configuration Manual

Chapter 1 Overview
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VLAN Features

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OL-13018-03
Optional spanning-tree features available in PVST+, rapid-PVST+, and MSTP mode:
Port Fast for eliminating the forwarding delay by enabling a port to immediately change from
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the blocking state to the forwarding state
BPDU guard for shutting down Port Fast-enabled ports that receive bridge protocol data units
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(BPDUs)
– BPDU filtering for preventing a Port Fast-enabled port from sending or receiving BPDUs
– Root guard for preventing switches outside the network core from becoming the spanning-tree
root
– Loop guard for preventing alternate or root ports from becoming designated ports because of a
failure that leads to a unidirectional link
Support for Resilient Ethernet Protocol (REP) for improved convergence times and network loop
prevention without the use of spanning tree, including configuration of REP edge ports when the
neighbor port is not REP-capable
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)
Cisco IE 3000 Switch Software Configuration Guide
Features
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