Tag: STP


Spanning Tree (STP) is running on all switch ports by default once the daemon is enabled.  STP first LISTENS and LEARNS before FORWARDING traffic.  It's the LISTENING and LEARNING states that delays traffic from being delivered to end devices.  The lack of FORWARDING during the LISTENING and LEARNING interval can cause IP address configuration failure ... Read More
April 1, 2014Praveen Bahethi


Multi-Instance Spanning Tree (MSTP), IEEE 802.1.q-2005,  to allow for additional features in Rapid Spanning Tree Protocol, such as "Per Vlan" STP as is found in PVST+. The concept behind MSTP is that Layer 2 devices could be further subdivided into regions and vlans could be added to the regions as instances. ... Read More
March 27, 2014Praveen Bahethi
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Link Aggregration Control Protocol (LACP) is used to combine multiple ethernet ports into a bundle.  This bundle shows up as one port to spanning tree protocol (STP) allowing multiple connections to occur between switches without blocking.  This protocol is also used to connect multiple server links to a switch to ... Read More
March 26, 2014Praveen Bahethi


Configuring STP on Cisco switches is straightforward since STP is on by default.  This default ensures loop-free topologies when connecting Cisco Switches and is very useful in Campus and Access LANs. For our example, we'll be using the network topology below. The switches are in a triangle with switchA as ROOT of ... Read More
January 15, 2014Praveen Bahethi