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Catalyst 2940 Switch Software Configuration Guide
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Chapter1 Overview
Features
Note Refer to the release notes for the list of Catalyst switches eligible for switch clustering, including
which ones can be command switches and which ones can on ly be me mber sw itch es. Se e
Chapter5, “Clustering Switches,” for the required software versions and browser and Java
plug-in configurations.
Performance
•Autosensing of speed on the 10/100 and 10/100/1000 ports and autonegotiation of duplex mode o n
the 10/100 ports for optimizing bandwidth
•Automatic medium-dependent interface crossover (Auto-MDIX) capability on 10/100 and
10/100/1000 Mbps interfaces that enables the interface to automatically detect the required cable
connection type (straight-through or crossover) and configure the conn ec ti on ap pro pri at ely
Note Auto-MDIX is not supported on 1000BASE-SX or -LX Small Form-Factor Pluggable (SFP)
interfaces.
•Fast EtherChannel for enhanced fault tolerance and increased band width between switches, routers,
and servers
•Per-port broadcast storm control for preventing faulty end stations from degrading overall system
performance with broadcast storms
•Port Aggregation Protocol (PAgP) and Link Aggregation Control Protocol (LACP) for automatic
creation of EtherChannel links
•Internet Group Management Protocol (IGMP) snooping for IGMP versi ons 1, 2 , and 3 to l imit
flooding of IP multicast traffic
•IGMP report suppression for sending only one IGMP report per multicast router query to the
multicast devices (supported only for IGMPv1 or IGMPv2 queries)
•Multicast VLAN regitime-stamptime-stampstration (MVR) to continuously send multicast streams
in a multicast VLAN while isolating the streams from subscriber VLANs for bandwidth and security
reasons
•IGMP filtering for controlling the set of multicast groups to which hosts on a switch port can belong
•IGMP throttling for configuring the action when the maximum number of entries is in the IGMP
forwarding table
•Dynamic address learning for enhanced security
•Protected port (Private VLAN Edge) option for restricting the forwarding of traffic to designated
ports on the same switch
Manageability
•Address Resolution Protocol (ARP) for identifying a switch through its IP address and its
corresponding MAC address
•Cisco Discovery Protocol (CDP) versions 1 and 2 for network topology discovery and mapping
between the switch and other Cisco devices on the network
•Network Time Protocol (NTP) for providing a consistent timestamp to all switches from an external
source
•Directed unicast requests to a Trivial File Transfer Protocol (TFTP) server for obtaining software
upgrades from a TFTP server