Ports on the root bridge are never placed in a blocking state. This version is called pvst per vlan spanningtree and its the default on cisco switches. Spanning tree protocol used by switches to turn a redundant topology into a spanning tree disables unwanted links by blocking ports stp defined by ieee 802. Hp port 2 to connected to a cisco switch external network provider. A variant of this solution is the rapid spanning tree protocol rstp, an evolution of the spanning tree protocol stp, which can be used to manage traffic loops and broadcast congestion in mesh. Introduccion y configuracion del spanning tree protocol stp. One of the most confusing things to understand when learning about the switched part of network is the spanning tree protocol stp 802. Spanningtree protocol is a link management protocol that provides path redundancy while preventing undesirable loops in the network. These presentations are the result of a collaboration among the instructors at st. Spanning tree protocol stp was developed before switches were created in order to deal with an issue that occurred with networks that were implementing network bridges. The convergence time for legacy spanning tree protocol stp ieee 802.
The external network provider has advised us to disable stp on our hp switch. Aug 04, 2011 spanning tree protocol stp is standardized as ieee 802. How spanning tree protocol stp select root port, spanning. In this article, we will try to understand the basic concepts of spanning tree protocols and their implementation. Protocolo spanningtree stp by marisol grupo redes on. A redundant link is an additional link between two switches. Second, when redundant loops are planned on a network, stp deals with remediation of network. The need for the spanning tree protocol arose because switches in local area networks are interconnected using redundant links to improve resilience should one connection fail. Spanning tree protocol stp is standardized as ieee 802.
Understanding spanning tree protocols stp, rstp, mstp. Portfast is a cisco network function which can be configured to resolve this problem. Now observe the status of spanningtree instances of every vlan. Protocolo stp spanning tree protocol by fernando polo on. In the graph, all potential neighbors are connected. The basic function of stp is to prevent bridge loops and the broadcast radiation that results from them. Spanning tree protocol algorithm tutorial duration. Spanning tree also allows a network design to include backup links providing fault tolerance if an active link fails. We start with the graph where the vertices are the cells and the edges represent the neighbors we can move to in the maze. This factor of time is not an issue for many people, but it can cause problems for. Stp was created to avoid the problems that arise when computers compete for the ability to use the shared telecommunications path on a local area network.
Understanding and configuring spanning tree protocol stp on. Thanks must go out to rick graziani of cabrillo college. Desenvolvimento do protocolo rstp rapid spanning tree protocol. Another version of spanningtree is able to calculate a topology for each vlan. The time spanning tree protocol stp takes to transition ports over to the forwarding state can cause problems. Spanning tree protocol wikipedia, a enciclopedia livre. Download pdf stp spanning tree protocol step by step configuration tutorial when sw3 start receiving inferior bpdus at its interface from sw2, switch3 would ignore the inferior information until the bpdus stored with the blocked port expires max age timer 20 seconds. Stp spanning tree protocol step by step configuration.
We have one hp 1920 connected to a dell sonicwall tz 300 on hp port 1. In this case, spanning tree protocol will choose the port on the local switch, which recieves the bpdu with lowest physical port number from the neighbour switch as the root port. Stp spanning tree protocol explained with examples. For example, a broadcast or multicast packet that transmits from station m and is destined for station n simply continues to circulate between both. When the network is converging on a topology change, no traffic is forwarded to or from any of the network bridges and switches. Spanning tree protocol linnbenton community college. For example, on a 2960, that would be fastethernet 01 or gigabit 01. Spanning tree protocol stp is a layer 2 network protocol used to prevent looping within a network topology. The spanning tree protocol stp is a network protocol that builds a loopfree logical topology for ethernet networks. First, it prevents problems caused by loops on a network. Spanning tree protocol is a link management protocol that provides path redundancy while preventing undesirable loops in the network. Sw5 has two paths with the same accumulated spanning tree path.
Simple protocol enhancements of rapid spanning tree protocol. Protocolo spanningtree stp by marisol grupo redes on prezi. In modern networks this spanning tree protocol stp convergence time gap is not acceptable and cisco enhanced the. As the name suggests, it creates a spanning tree within a mesh network of connected layer2 bridges typically ethernet switches, and disables those links that are not part of the spanning tree, leaving a single active path between any two network nodes. This factor of time is not an issue for many people, but it can cause problems for some. Stp spanning tree protocol automatically removes layer 2 switching loops by shutting down the redundant links. For example, setting path cost on ports that are in a root bridge has no effect, only port priority has an effect on them. Protocolo stp spanning tree protocol by fernando polo on prezi. Just like every coin has two sides, a redundant link, along with several advantages, has some disadvantages. Configuracion del protocolo spanningtree redes locales.
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