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Questions tagged [spanning-tree]

55 questions
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5 answers

If you turn on spanning tree, how do you know there is an issue with your network?

I have been learning about spanning tree protocol (STP/RSTP/MSTP) and was wondering, once I turn it on and it's protecting against for example network loops, how do I know there is a network loop? I suppose in most cases it would be obvious, because…
Scott Szretter
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Spanning Tree Setup

I understand the basics of spanning tree, but that's about it. I'm hoping that someone can tell me if this will work as I want it to. I've got two Cisco ACE load balancers setup for redundancy. Each ACE is connected to its own layer 2 switch. …
mrdenny
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Proper method for connecting multiple non-stackable network switches?

I deal with many clients in warehousing and industrial applications who have IT staff or local consultants. Many of these sites are still using a 10/100 Megabit switching backbone... I've managed to get some clients to invest in networking as a part…
ewwhite
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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 device (HP switch 1 below) at which time the…
Tim Brigham
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1 answer

Layer 2 Loop Avoidance: Three Switches in Series

I know this seems like a homework question, but it's actually part of a larger project (and network) and need to break it down into chunks so I'm clear with what I'm doing. I've never worked with [R/M]STP and have only setup a static LAG before, so…
WuckaChucka
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Setting spanning tree link "priorities" in Cisco switches

I've got a pair of C2960G-48 switches (running IOS 12.2(46)SE, if it makes a difference) with redundant trunks in place. On these switches there are a bunch of VLANs that carry quite heavy traffic at times (enough to completely saturate the trunks…
womble
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How to troubleshoot a MAC flapping between switch ports. (Cisco)

I'm working on a rather small Layer 2 network segment that contains a physical loop. (I have included a picture of the topology below). The core switches are stacked 3850s. The other switches are SG300 series small business switches. The links…
blacklight
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HP ProCurve Preventing Loops and Users Plugging in Unauthorized Switches/Access-Points

We have a HP ProCurve 2530-24-PoE (J9773A) switch, recently I had a user who plugged in an Apple wireless hardware device to the network - whenever it was connected I got a ton of broadcast warnings from the switch, intermittent bouts of packet loss…
morleyc
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Group Policy Application on Boot with MSTP & really really fast computers

The latest generation HP computers with solid state drives and Win 10 are booting so fast that Multiple Spanning Tree Protocol is not allowing network access in time for Group Policy to process on startup. • Always wait for the network at computer…
Dom
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STP in a mixed environment

Good day all, We have some a mixed environment of Dell Powerconnect and Cisco switches. On both brands of switches, I am seeing numerous STP topology changes. I've decided to try on work on the Dell switches first. The root switch is a Cisco…
Richard
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Redundant Ethernet links from a Linux box

This could be an RTFM kind of question. If so, I'll gladly award the answer to whoever gives a link to TFM :) In my racks, I've got redundancy all over the place. Two sets of switches, two upstream routers, two power paths, dual power supplies in…
Bill Weiss
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How to anticipate spanning-tree changes to prevent packet loss during convergence?

We have a LAN with Cisco switches, redundant cabling and spanning tree. If I understand it correctly, when I pull out a redundant cable (that is currently "used" by the spanning tree) it takes several seconds until the spanning tree converges in…
Hagen von Eitzen
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Configure spanning tree from HP to Cisco hardware

I have three switches I'd like to configure in a loop - a Cisco stack (3750s) and two HP 2900 series. Each is connected to the next with a 10 gig backplane of one form or another. How do I configure the spanning tree on these systems to make this…
Tim Brigham
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Network topology, clearing congestion

Our networking components consist of (3) x D-Link DGS 1248T Switches, and a router. We have 4-5 servers running as VMWare Host, HTTPD, and Storage. The clients on the network are connected to the switches via a patch panel. For the most part, our…
David Houde
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Preventing packet storm on VLAN

I've got a connection in a datacenter where the network provider gives me two Ethernet connections. They're supposedly hooked up to the same VLAN, such that I can wire them up to my switch and only one of them will be active at a time, but either…
natacado
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