Cisco WS-C2960S-24PD-L Software Guide - Page 25

Chapter 1 Overview Features Table 1-1 Features (continued) Manageability • Dynamic Host Configuration Protocol (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. • Directed unicast requests to a Domain Name System (DNS) server for identifying a switch through its IP address and its corresponding host name • Address Resolution Protocol (ARP) for identifying a switch through its IP address and its corresponding Media Access Control (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 administering software upgrades from a TFTP server • Default configuration stored in Flash memory to ensure that the switch can be connected to a network and can forward traffic with minimal user intervention • In-band management access through a CMS web-based session • In-band management access through up to 16 simultaneous Telnet connections for multiple command-line interface (CLI)-based sessions over the network • In-band management access through Simple Network Management Protocol (SNMP) versions 1 and 2c get and set requests • Out-of-band management access through the switch console port to a directly-attached terminal or to a remote terminal through a serial connection and a modem Note For additional descriptions of the management interfaces, see the "Management Options" section on page 1-6. Redundancy • HSRP for command switch redundancy • UniDirectional link detection (UDLD) on all Ethernet ports for detecting and disabling unidirectional links on fiber-optic interfaces caused by incorrect fiber-optic wiring or port faults UDLD recovery for automatically reenabling the port after a specified age time. This feature is not available on the Catalyst 2900 LRE XL switches. • IEEE 802.1d Spanning Tree Protocol (STP) for redundant backbone connections and loop-free networks. STP has these features - Per-VLAN Spanning Tree (PVST) for balancing load across virtual LANs (VLANs) - Port Fast mode for eliminating forward delay by enabling a port to immediately change from a blocking state to a forwarding state - UplinkFast, Cross-Stack UplinkFast, and BackboneFast for fast convergence after a spanning-tree topology change and for achieving load balancing between redundant uplinks, including Gigabit uplinks and cross-stack Gigabit uplinks - STP root guard for preventing switches outside the core of the network from becoming the STP root Note Up to 64 instances of STP is supported on each switch (see Table 8-1 on page 8-2). 78-6511-08 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 1-3