spanning tree protocol

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spanning tree protocol

An algorithm that runs in network bridges and switches to prevent loops, in which packets keep going around in circles. In a small network with one or two switches, the spanning tree protocol (STP) has little value; however, in a large network where many switches are connected to each other via bridges, redundant paths can cause loops.

The algorithm creates a hierarchical "tree" that "spans" the entire network. It determines all redundant paths and makes only one of them active at any given time. In addition, if there are redundant paths and one of them fails, it allows the other to take over. The spanning tree protocol is part of the IEEE 802.1 network management standard. See IEEE 802 and BPDU.
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Low Cost Ring Architectures - The LE-135 enables GigE Ring Architecture with customer demarcation at 100Mbps and/or GigE over fiber and/or copper with SONET-like resiliency and stability provided by World Wide Packets' carrier Rapid Spanning Tree Protocol (RSTP) and Rapid Spanning Tree Domains (RSTPD).
Other key features include: * 12-port 10Gbps L2 Ethernet switch models * 10GBASE-SR, LR, ER, LW and CX4 XENPAK interfaces (XG1200) * 10GBASE-CX4 interfaces (XG700) * 10Gbps wire speed switching operation * 240Gbps non-blocking switching * Cut-through and store-and-forward switching * 450ns fall-through latency (under unloaded conditions, excluding optical modules) * Rapid Spanning Tree Protocol * QoS based on DiffServ and VLAN priority * Jumbo frame support up to 15KB * Management via Telnet / serial * RMON, SMON and SNMP * Link pass-through * Hot plug redundant power supplies and cooling fans
Low Cost Ring Architectures - The LE-310 enables GigE Ring Architecture with customer demarcation at 100Mbps and/or GigE over fiber and/or copper, and SONET-like resiliency and stability provided by World Wide Packets' carrier Rapid Spanning Tree Protocol (RSTP) and Rapid Spanning Tree Domains (RSTPD).
Switches that support Rapid Spanning Tree Protocol (R/STP) can automatically locate and cut loops.
The ServerIronGT E-series family supports redundant power, hot standby operation and standards-based self-healing protocols including link aggregation, rapid spanning tree and virtual routing redundancy protocol (VRRP), providing a high-availability application load balancing and traffic management solution for the most demanding data center environments.
The new upgraded T5 Compact, which supports the IEEE Multiple Spanning Tree Protocol (MSTP) and Rapid Spanning Tree Protocol (RSTP) standards, can achieve recovery from outages in as little as 15 milliseconds in large 14 node rings and easily equals SONET performance of less than 50 milliseconds in much larger rings.
In pre-deployment, UNH-IOL used the Spirent SmartBits Performance Analysis Test System to determine convergence, latency, packet loss, throughput, and other performance measurements of LAN switches and routers using Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol (RSTP).
The advanced routing and switching capabilities of the FSM7326P include: IPv4 routing at wire speed with up to 512 routes per unit, VRRP (IP redundancy), ICMP, RIP I and RIP II, OSPF2, DHCP/BOOTP relay, port trunking, broadcast storm protection, extensive VLAN support, IGMP snooping, Rapid Spanning Tree, link aggregation, DiffServ, access control lists, and bandwidth provisioning.

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