Questions tagged [ieee-802.1w]

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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48 views

RSTP sending BPDUs out of the network switch?

I need some information about RSTP If the port state is blocking, discarding alternate . Should BPDU be sent to external ports? I cant see any BPDU in wireshark if the port states Alternate,Discarding ...
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32 views

STP configurations

In my design, there will be a few be a few rings of edge switches that are connected to my distribution switch. (alcatel 6860-U28) The distribution switch will then be connected to my core router ( ...
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2answers
63 views

RSTP Loop - 24 switches, Max RSTP Diameter and timer adjustments?

First time poster and the more I read aboud RSTP, the more questions I have in relation to my situation. I have found myself recently assigned to a project that has been essentially delivered on a ...
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2answers
94 views

Do I need STP enabled on all switches in a loop?

I have a network architecture where each of my N switches is connected to two others, making it a perfect loop. For example see the diagram below: I know that in order to avoid broadcast storms, I ...
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1answer
61 views

RSTP Sync received every 2 minutes after a TC

While digging into logs (debug spanning-tree event has been enabled) in order to troubleshoot communication losses after topology changes. I was able to notice once I triggered a TC, one specific ...
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1answer
50 views

Fastest way to switch between redundant wireless links

I have a system using 2 redundant point-to-point wireless links to access the internet, and I'm trying to find the fastest way to switch between them if one goes down. We need to switch within 1 ...
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1answer
45 views

What is the impact of VTP pruning against RSTP topology?

While working on a network using VTP (without pruning yet), I noticed the STP topology (for VLAN 10 let say as an example) was including all switches even the ones not having any interface in the VLAN ...
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1answer
40 views

Endianness of data fields inside BPDU

I'm working on a frame/packet decoder and am seeing inconsistent data regarding the endianness of the MaxAge/Hello/ForwardDelay fields inside a spanning-tree BPDU. Below is a picture of a wireshark ...
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1answer
83 views

Brocade/Ruckus per vlan spanning tree vs Cisco

Brocade = (config-vlan-10)#spanning-tree rstp This seems to enable rstp per vlan. This example enabling it on vlan 10. Cisco = spanning-tree mode rapid-pvst This enables Rapid PVST+ under the covers ...
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2answers
562 views

RSTP recovery time with Ethernet ring

I am trying to test Rapid Spanning Tree on an Ethernet ring. Most of what I found does not seem to apply to my specific situation, but I am happy to be pointed elsewhere. Specifically, I have one ...
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2answers
1k views

Fastest spanning tree in multiple-ring topology

I have a topology in which there is a main ring and some nodes in the main ring have a minor ring. 1- which STP configuration has the fastest convergence time? How would you configure spanning tree ...
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1answer
147 views

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
540 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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1answer
49 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
136 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
203 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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0answers
376 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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1answer
756 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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2answers
2k 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
524 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
466 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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1answer
580 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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0answers
148 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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1answer
558 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
427 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
179 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
4k 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
1k 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
605 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
231 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
247 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 ...