Questions tagged [stp]

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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Advice required for sending STP BPDU traffic between tap interfaces connected by common bridge

Need advice for the bridge tap interface to run stp traffic. created the tap interface and bridge   Have come across stp BPDU is consumed by bridge. i'm running the scapy on the host, however i'm not ...
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Setting up a virtual environment for STP testing

I'm looking to create a test environment for STP / RSTP. I eventually came by this post that suggested using namespaces. It seemed like that was exactly what I'd wanted to create the simplest STP ...
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In the STP root bridge election process, how do switches advertise themselves as the root bridge if all of the ports start in the blocking state?

In the STP root bridge election process, all of the switches advertise themselves as the root bridge until they receive a superior BPDU. Every source about STP says that after initialisation all of ...
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STP Packet Filtering

I have a KVM host with guests joined to a virtual bridge for networking. Netdata on guests of this system drew my attention to packets being dropped at the network interface level (the metric reported ...
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stp - avoid links with packet loss

We have a set of devices connected in a ring, that are using stp (using https://github.com/mstpd/mstpd at the moment) to avoid issues with the loop. What we have seen, is that while stp can adapt the ...
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Can Linux kernel support RSTP (802.1w)?

Last week, I ran Spanning Tree Protocol (STP) in Linux kernel successfully. Now, I am trying to support Rapid Spanning Tree Protocol (RSTP) in Linux kernel. I also found out some solutions in user ...
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Understanding KVM Bridges

I've spent a few days learning and playing with KVM. I understand a Bridge is like a virtual unmanaged switch. I looked at a few install guides (i.e. https://www.itzgeek.com/how-tos/linux/centos-how-...
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What variant of STP is implemented in the Linux kernel?

(moved to SF from NEng on moderator's request) We are developing some switch management software on top of Debian 10, Linux kernel 4.19. We are using Linux bridges (offloaded to proprietary hardware ...
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HP Procurve STP Path Blocking

I have four Switches that are interconnected with each other, witch form a loop as shown in this network diagram The switch 1 is the root bridge and is connected to the primary edge router. The ...
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STP packets dropped (1 packet every 2 seconds) when irrelevant multicast group joined on the interface

I'm trying to understand weird packet drop issue when joining particular multicast group. I think this issue is related to patch introduced in kernel ver 2.6.37 Beginning with kernel 2.6.37, it has ...
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LACP and STP configuration

I am trying to understand LACP in the context of STP. Case 1. There is a server connecting to 2 different switches for redundancy purpose and a bond interface created with 2 slaves physically ...
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Netgear Switches GS748Tv4 and v5 ports go down and up and Spanning Tree Topology Change

I'm getting notifications on my Syslog server from the Netgear switches GS748Tv4 and v5. These are the notifications: traputil.c(696) 122305 %% Link Down: g30 traputil....
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Setting up STP network to isolate traffic from router? [closed]

So I've been the self taught IT guy in my household for quite some time. I have a household with incredibly high traffic. 4-6 people connected simultaneously. Gaming, home theater network, video ...
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RSTP over tunnel?

tl;dr: Is it possible to run RSTP over l2tp or MPLS? We have leased one gig capacity from a service provider's network, over which we sent a udp multicast traffic. The provider gives us drop at our ...
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Configure STP in WAN Bridge

Hardware: 2 pFsense Box 1 Switch Dlink DGS-3324SR I need to configure a STP into my network because i'm trying to set a wan redundant bridge for a web server. (Take a look to my Network Diagram) So ...
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Windows network bridge: STP parameters [closed]

I recently discovered Windows 7 does support STP upon it's own Ethernet bridges. https://reggle.wordpress.com/2011/09/03/hidden-feature-in-windows-7-spanning-tree/ Although the feature is barely ...
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Cisco VSS failure.

We have two 6500s running with VSS. We have a switch with dual uplinks. Each uplink goes to a different 6500. If the VSL between the 6500s goes down then they both become active. This breaks the ...
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VMWare ESXI vNetworking - vSwitches bridged by multiple multiple Layer 2 bridge hosts

I want to create a multi-VM pfsense cluster ESXI. For those that are not familiar with pfsense, consider it a Free BSD based router/switch (with many features on top of it, but not necessary for this ...
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Layer 3 switch redundancy solution (with vlan's, stp)

So basicly I have a setup which I want to get to work but i'm unable to. It's possible I am overseeing a lot of things but let's get to it anyways. The current situation is a network with 4 switches ...
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STP fixes non-looped network. Dumb switches kill network. Can anyone decipher this wireshark readout for me?

Greets long story short we had a power outage here and when the network came back online it would crash out to a flood of ARP requests. This would lead to packet storm/network loop, but after ...
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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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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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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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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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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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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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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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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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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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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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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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4 votes
1 answer
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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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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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3 votes
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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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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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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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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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