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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 1 Overview
Features
• Port blocking on forwarding unknown unicast and multicast traffic (available only on the
Catalyst
LRE switches and on the Catalyst 2950G-12-EI, 2950G-24-EI, 2950G-24-EI-DC,
2950G-48-EI, and 2955 switches)
• 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 versions 1, 2, and 3 to limit
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 registration (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
• Protected port (private VLAN edge port) option for restricting the forwarding of traffic to designated
ports on the same switch
• Dynamic address learning for enhanced security
Manageability
• Cisco Intelligence Engine 2100 (IE2100) Series Cisco Networking Services (CNS) embedded
agents for automating switch management, configuration storage and delivery (available only with
the
EI)
• DHCP-based autoconfiguration for automatically configuring the switch during startup with IP
address information and a configuration file that it receives during DHCP-based autoconfiguration
Note DHCP replaces the Bootstrap Protocol (BOOTP) feature autoconfiguration to ensure
retrieval of configuration files by unicast TFTP messages. BOOTP is available in earlier
software releases for this switch.
• DHCP server for automatic assignment of IP addresses and other DHCP options to IP hosts
(available only on the Catalyst
2955 switch)
• DHCP-Based Autoconfiguration with a saved file
• Address Resolution Protocol (ARP) for identifying a switch through its IP address and its
corresponding MAC address
• Unicast MAC address filtering to drop packets with specific source or destination MAC addresses
(available only with the EI)
• 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 time stamp to all switches from an external
source
• Directed unicast requests to a TFTP server for obtaining software upgrades from a TFTP server