The Spanning Tree Protocol (STP) is a network protocol that ensures a loop-free topology for any bridged Ethernet local area network.

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Network flow path using spanning tree protocol

I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between ...
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STP/RSTP: what switch should do with MAC table on a port after changing STP role of this port?

I have two switches and two active links between them. Spanning Tree Protocol is enabled on both devices, and port roles are assigned correctly: there are two Designated/Forwarding ports on RootSwitch ...
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51 views

Do you need STP on ProCurve trunks?

We have 3 switches - a Core Switch, and 2 downstream switches. Each downstream switch has a 3 cable Trunk direct to the core switch. However - when we disconnected one cable in that trunk group ...
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371 views

Spanning Tree Necessary With 2 Stacked Dell Managed Switches?

I have a PowerConnect 6248 and 6224P stacked with the 6248 acting as the managing switch. They're connected using the 48Gbps stacking module with 2 cables running between the switches. Do I need to ...
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59 views

MSTP with looped port

I have a configuration with two switches connected via a single Ethernet port. A second port of the first switch is looped back (Tx connected to Rx). They have 10 MSTI configured on VLAN from 100 to ...
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426 views

Blocking STP Traffic

I am using Xen virtualization with a bridged mode netwrk. I noticed that there is a lot of spanning tree (as understand) traffic coming from a network. Such as: STP 802.1d, Config, Flags [none], ...
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Best way to provide redundant switching/links to server

We have 3x ESX hosts and 2x SANS that we wish to move to a redundant 10G networking infrastructure. We have 4x Dell PowerConnect 8024F's to provide our backbone and are configured as so (only core ...
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109 views

3 dedicated wires for 3 VLANs between two switches: (M)STP failing

looking for a couple of hints from you we have a small but peculiar networking need: - 3 vlans, that are to be propagated among two L2 switches - we need to partition the vlans as much as possible, ...
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188 views

STP Algorithm: Ports have same cost to root, which port is set to blocking?

Here's the situation: There is a bridge that has the lowest ID within a loop. This bridge has two ports, both with equal cost to the root, how does STP decide which port is forwarding, and which port ...
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STP on network with one switch

If a network has only one switch, does STP take place ? Also, if it does, do the ports of the switch become designated ? Thank you.
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Inexplicable STP Behaviour

I have a problem with a couple of Dell PowerConnect 6248 switches (latest firmware) connected to a pair of external (3rd party) switches providing Internet connectivity via HSRP. I'll post more ...
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STP on a bridge

I have set up a bridge on an interface em1 and connected 4 vms to the bridge. I disabled stp on the bridge. There is no chance of looping as there is only one bridge in this setup, there occurs a BPDU ...
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HP to Cisco spanning tree root flapping

Per a recent question I recently configured both my HP (2x 2900) and Cisco (1x 3750) hardware to use MSTP for interoperability. I thought this was functional until I applied the change to the third ...
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493 views

Does it make sense to enable STP if I have only one managed switch?

Does it make sense to enable STP if i have only one managed switch maintaining STP in the network ? I have a tree topology with the root Main Managed switch, connected with the router ( router is ...
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235 views

MSTP unresponsive to topology change between HP 5412 zl and HP 5406 zl

As title says, having some trouble with MSTP configuration. I have an HP 5412 zl and an HP 5406 zl essentially connected with 2 cables between then , one link being primary (P) and second being ...
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165 views

Ways to test CISCO REP

Linked to Good reference for Cisco Resilient Ethernet Protocol I am looking to demonstrate REP's effectiveness to non technical people, on an Industrial Network at a local university. I am a software ...
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437 views

INFORMIX - listener thread err 25582

I´ve been digging different forums in the last 7 days looking for a possible solution.... Our database is based on informix running in a Linux server (LINUX SUSE 11). Suddenly, last saturday informix ...
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Will RSTP BPDUs be encapsulated in tagged Ethernet frames?

RSTP(Rapid Spanning Tree) is configured on a bridge. All ports of this bridge are "trunk" ports and are part of vlan “x”. Will the BPDUs sent out of this bridge be tagged?
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spanning tree protocol(STP) bridge priority configuration

I'm trying to figure out the appropriate spanning tree protocol settings for a redundant network topology I'm in the process of implementing. The graphic demonstrates what the physical layer will look ...
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What benefits are there to enabling STP on a WiFi access point?

Our network switches have STP enabled, and I see that my APs have an option to enable STP as well. The purpose of STP is to prevent network path loops, but the AP only has one connection back to the ...
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171 views

2 HP Procurve 4000M trunked switches and Comcast SMC Gateway

We've got 2 HP Procurve 4000M switches joined by a trunk. Switch 1 is connected to a Cisco 2600 router which is connected to a T1. Internet traffic for hosts on switch 2 must pass through the trunk. ...
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3k views

Spanning Tree Protocol (STP) to prevent network loop back issues?

I have several locations with managed network switches - for example, one being a stack of 3com 4500's. On occasion we have an issue where a user somewhere in the building decides to plug in their ...
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Spanning tree problems in a shared HP ProCurve environment

we're sharing a server room with another company, including the network infrastructure. All the switches are HP ProCurve, in various models depending on port need and so on. We're using VLANs to ...
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KVM and bridge_stp setting

In which situation one should enable the bridge_stp for the host bridge when using KVM? Is it worth keeping it disabled when not needed?
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301 views

HP Network Device Management Software

I look after a network with 11 x new HP v1910 24-port 1GB switches and 2 x HP 4204vl 1GB Chassis switches. I'm looking for software to enable me to: Map the network graphically - there are a lot of ...
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608 views

Linux bridge redundancy

I make heavy use of Linux Bridges (brctl) as I have a Xen environment. At the minute, only one physical NIC is connected to the bridge (There are many virtual NICs for the Xen VMs though). In order to ...
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How should I connect a redundant switch arrangement to the rest of the network?

My servers all have two NICs and I have two Ethernet switches (A and B) dedicated to the servers, in a redundant configuration. I have configured the NICs with bonding (Linux) or teaming (ESXi), and ...
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593 views

For a switch using RSTP (or MSTP) on which port states/roles does it send BPDUs?

In trying to wrap my head around MSTP and RSTP I have read conflicting information about which ports a switch will send BPDUs through. It is clear to me that for MSTP the switch sends the BPDUs needed ...
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427 views

What is preferred in VLAN environment, global spanning tree or per-vlan spanning tree?

Suppose you have a big switch with several VLANs. What is the recommend best practice with regards to spanning tree? I see you can configure global spanning tree, and there is per-VLAN spanning tree. ...
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215 views

Cisco BPDUGUARD and BDPUFILTER

What happen if I have both ENABLED spanning-tree BPDUFILTER and BPBDUGUARD on a specific port?
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Having an IP address configured on a port, will it participate in Spanning tree protocol instance?

Having an IP address configured on a port, will it participate in Spanning tree protocol instance?
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Use Cat5 or Cat6, UTP or STP in Data Center?

I'm about to buy cables for our first data center install. It's all Gigabit Ethernet. Should we use Cat5 or Cat6, UTP or STP?
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257 views

Cisco switch sending out excessive STP packets

I have a Catalyst 2900 that's sending out an STP packet about once ever 1-2 seconds. Is that excessive?
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Want to make switch root for STP, command not available

I want to make a certain switch in the network root, but all I remember is the command "set spantree root vlan-id" Sadly, the "set" command is not available on this switch. How do I proceed? EDIT: I ...
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What is the relation between a VLAN and STP

I want to know the relation between VLAN and STP protocol.Since STP is running over each port,how VLANs associated with this.Also I want to know the MIB which gives the data regarding STP for a ...
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339 views

Disable STP in Opensolaris bridge

how can i completely disable STP in a Opensolaris bridge. This bridge is connected to a Cisco Access Port and will disable the uplink port when the first BPDU arrives. bridged[3651]: [ID 581644 ...
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Optimal performance settings for Spanning Tree Protocol (802.1d) for LAN (gaming) environment

The topic covers a few topics, so I would try to break this down further as means to provide more information as well as gain a better understanding about the technology. First some background - we ...
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Will this cause STP to reconverge?

If I configure a second interface on the router to connect to the same network as the other, will it cause spanning-tree to reconverge when I plug it into the switch? E.g. existing interface is ...
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What does Spanning Tree Protocol (STP) do?

Someone please explain what Spanning Tree Protocol (STP) actually does in layman's terms. I know it can cause problems with some network gear, but that's the extent of my knowledge.