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For questions about Rapid Spanning-tree protocol (RSTP). For instance, you are troubleshooting an issue where Spanning-tree is not forwarding the correct VLANs on your trunk.

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Spanning Tree Priority Vectors

Out of personal interest I am working my way through the IEEE standards 802.1D-2004 and 802.1Q-2014. I am using the earlier document to clarify meaning in the later document, since the addition of ...
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2answers
135 views

spanning tree loop with bpdufilter on acces port but not on trunk?

┌─────┐ ┌─────┐ | A ┼------┼ B | └─────┘ └┬───┬┘ └---┘ <-- loop behold the above drawing. this is a test setup connectin switch A and B, and a test loop A: cisco ...
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41 views

Edge detection on designated ports

If a switch doesn't receive a BPDU on a particular port it marks this port as "Edge Port". But any designated port won't receive any BPDU even though it was connected to other switches since their ...
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1answer
53 views

Trying to configure STP on a small network and have a few questions

I am trying to configure the switches on a network to use STP or RSTP but I'm confused about how to do this. The network consists of 3 switches, all on the default subnet, so a fairly simple setup. ...
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1answer
100 views

What considerations should I need to have in order to configure a RSTP over a PTP wireless network?

I have configured a PTP wireless network that requires RSTP protocol in order to manage redundance loops. Most of the loops are 4 points big, but there is a big one of more than 15 points. The most of ...
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184 views

Adding new switch to Spanning Tree network

Currently studying Spanning Tree, I'm not sure about the behaviour when we add a new switch to an existing STP topology (with cisco pvst+). Assuming we plug this new bridge called S4 with only one ...
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286 views

Does a switch generate TCN BPDU when it elects a new root bridge?

what are the scenarios in which a switch generates a TCN BPDU other than when a port goes down or come back up? switch-1---------------switch-2----------------switch-3 (root bridge) (Non Root)...
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288 views

BPDU exchange between RSTP switches

According to the documentation: BPDU are sent every hello-time, and not simply relayed anymore. With 802.1D, a non-root bridge only generates BPDUs when it receives one on the root port. In fact, a ...
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4answers
297 views

H3C MST BPDU exchange failing

I am coming across the following MST issue. Between a HP5940 network core and HP5130 network access layer, I am using 5 instances of MST, configured like this : CORE switch stp region-configuration ...
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1answer
218 views

STP interface command shutdown STP globally

I'm in the process of studying to renew my CCNP again. 3 years comes and goes awful fast! While working on my lab gear I thought I wonder if I can shut down STP on a single interface like I've done in ...
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301 views

RSTP 802.1w maximum network loop diameter

Can anybody direct me to a calculation of the maximum network diameter (number of devices) on an RSTP tree (RSTP, NOT STP)? As far as I can understand from the standard and the RFC, there is no such ...
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107 views

When exactly the Proposal and Agreement flags are used in RSTP

When does the flags proposal and agreement are set in RSTP? What are its importance?
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216 views

Why is there a large difference between BPDUs sent and received counters for RSTP root port?

I just noticed a big difference in numbers looking at the sent and receive counters for RSTP BPDUs.The port I'm looking at is a root port. I see a very less number of BPDUs sent against to BPDUs ...
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2answers
219 views

RSTP Troubleshooting

We have about 30 switches (multiple vendors) in a network which consists of a main ring and several branches. A couple of the branches may have loops. Some of the switches are smart switches with ...
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2answers
68 views

How do I physically measure the re-convergence delay while RSTP determines the new topology after link loss?

I have a simple network with two switches redundantly connected to each other and several computers on each switch talking back and forth across the two switches. The switches support RSTP/MSTP. I ...
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2answers
1k views

How fast can STP, RSTP, and MSTP find a new route?

If I have two switches connected redundantly and both are capable of using STP, RSTP, or MSTP, how quickly can an alternate route be detected and normal communication resume if the main route is ...
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1answer
651 views

RSTP Vs STP Vs MSTP

I am sure this is a common question but would like to know the best practices. I have a pair of Juniper routers connecting to a IRFed HP 10k core switch. My HP core runs stp and we are tyring to ...
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3answers
297 views

Bridge is always root for a vlan

I have a switch that is not receiving BPDU Hellos properly and I have not been able to pin point the problem. Switch 1 puts all ports for vlan4 into desg mode and claims it is the root for vlan4 (the ...
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1answer
164 views

how ping a PC by another switch's console use secureCRT in rstp [closed]

In secureCRT SWC's console ping PCA in rstp demo in the pic? It's a loop Topology and on each switch I set stp mode rstp and every ports are bind default vlan1. I open the switchC's loopback 0 and ...
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1answer
192 views

Cisco 2960: RSTP finished when?

I have several Cisco 2960 switches here, all configured for RSTP. 15.0(2)SE6 C2960-LANBASEK9-M spanning-tree mode rapid-pvst Topology is as follows: S1 -- S2 -- S4 \ / \__S3__/ I ...