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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.

The Spanning Tree Protocol (STP) is a network protocol that ensures a loop-free topology for any bridged Ethernet local area network. The basic function of STP is to prevent bridge loops and ensuing broadcast radiation. Spanning tree also allows a network design to include spare (redundant) links to provide automatic backup paths if an active link fails, without the danger of bridge loops, or the need for manual enabling/disabling of these backup links.

STP is a Data Link Layer protocol. It is standardized as IEEE 802.1D. As the name suggests, it creates a spanning tree within a mesh network of connected layer-2 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.

STP is based on an algorithm invented by Radia Perlman while working for Digital Equipment Corporation.

SOURCE: http://en.wikipedia.org/wiki/Spanning_Tree_Protocol

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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 fibre and copper LACP links Provide a single view…
Alasdair C-S
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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. What is the preferred best practice in this…
Keith
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Cisco BPDUGUARD and BDPUFILTER

What happen if I have both ENABLED spanning-tree BPDUFILTER and BPBDUGUARD on a specific port?
Andre
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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?
kmrsn
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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 think I did it with the following command, in…
KdgDev
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Possible STP Issue with Cisco SG350 Switches

we are having a weird issue with a network of Cisco SG350 Switches that I cannot figure out. We are thinking it may be related to STP but have verified all the normal problem points (i.e. proper ports are showing as Root / SmartPort disabled /…
devGuru
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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 seeing the stp BPDU on the bridge nor on the…
Santosh Kumar
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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 the ports start in the Blocking state. If the ports…
dor
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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 as RX dropped by ifconfig). I tracked the…
user233054
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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-tos/install-kvm-qemu-on-centos-7-rhel-7.html). …
Ben Edwards
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Setting up STP network to isolate traffic from router?

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 streaming, skype and other voice chat use, printer…
Gaian Swine Helmers
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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 PoPs at different locations and we terminate the…
Raj
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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 question). Basically, I want to have two physical…
Ryan
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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 connected to each other (almost a full mesh, 1…
Ciberth
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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 careful auditing there appears no looping. I put an…
BurntSilicon
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