Cisco 2950G 24 Software Configuration Guide - Page 36
In-band management access through Simple Network Management Protocol SNMP versions 1, 2c - ei switch
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Features Chapter 1 Overview • 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 • Default configuration storage 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, 2c, and 3 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 1-7. 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 • 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 VLANs - 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 • IEEE 802.1S Multiple STP (MSTP) for grouping VLANs into a spanning-tree instance, and providing for multiple forwarding paths for data traffic and load balancing (available only with the EI) • IEEE 802.1W Rapid STP (RSTP) for rapid convergence of the spanning tree by immediately transitioning root and designated ports to the forwarding state (available only with the EI) • Optional spanning-tree features available: - Port Fast for eliminating the forwarding delay by enabling a port to immediately transition from the blocking state to the forwarding state - BPDU guard for shutting down Port Fast-enabled ports that receive 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 Catalyst 2950 Desktop Switch Software Configuration Guide 1-4 78-14982-01