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.
53 questions
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How Spanning tree (RSTP) will work in the below case
I have New 2xDELL Switches in VLT Domain connected to old 2xDELL Switches in another VLT Domain and the link between these switches should carry vLAN 5
However , vLANs 2,3,4 should be tagged on the ...
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RSTP Inferior BPDU receive on Alternate Port
As per the specification and the materials available online, RSTP is supposed to have the features like Uplink fast and Backbone fast already defined in the IEEE specification. I did have a look but I ...
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RSTP and MAC addresses: how should I ensure that the bridge switch has the lowest MAC?
I'm very confused about RSTP; what I've read states that the bridge is selected by either lowest priority (set in the switch configuration) or by lowest MAC. Does that mean that I have to "hand-...
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Maximum switch using RSTP or MSTP
Great to find you mates here.
I am new to Spanning Tree.
According to https://www.etherwan.com/sites/default/files/setting_up_stp-rstp-mstp_and_alpha_ring.pdf
STP can support up to 14 switches
RSTP ...
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RSTP Loop Limitations
Recently ,i joined a new company and they assigned me to a under progress site actually it was a hotel with two 12 storey building merged as a single 12 storey building.They have done cabling as per ...
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Need for additional Master Port Role in MSTP
MSTP IEEE specification, it says the Root Port for CIST will be the Master Port for all MSTIs. I'm wondering what is the need for this additional port role, is it just to isolate the region boundaries ...
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Will implementing a MSTP stack allow me to use that interchangeably between STP and RSTP
I've to provide support for STP/RSTP/MSTP, while going through the specification I see the Force Protocol Version majorly ensures compatibility between STP/RSTP bridges. Mostly, I see the transmission ...
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RSTP convergence of p2p links
Ramping up on RSTP here. One thing that is unclear to me is how RSTP links converge initially on P2P links. Consider the classic 3 switch topo as below:
For RSTP, won't all the links move to ...
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Equivelant of ciscos "spanning-tree portfast disable" in Juniper parlance
On our cisco network switches we have the following configuration:
interface GigabitEthernet1/0/1
description Main Internet 1
xxx
spanning-tree portfast disable
spanning-tree bpduguard disable
I ...
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How would a switch know that it should forward a frame through a different interface in a STP topology?
Imagine the following STP topology
If PC0 was to ping PC1, all of the switches would create entries in their MAC table according to the source MAC address of the PCs associated with the corresponding ...
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Does RSTP also maintain correct mac table entries?
I've got 4 switches connected in a circle and they all run RSTP. Lets assume the following:
switch A (root bridge) ------- switch D
| |
| ...
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RSTP / MSTP use cases and best practices
Hi, what would be the best practice to achieve separate tree topologies for each of the rings? Two options come to my mind, although I do not completely understand IF RSTP can be made VLAN-aware ...
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STP convergence process needs detailed explanation, please
So, I understand how STP convergence works on high-level. However, when I am trying to look into the process deeper, I run across some doubts I would appreciate someone could clarify to me.
Here we go:...
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Why does only the root bridge send RSTP BPDUs after sync?
From a recent packet capture, after the sync process in RSTP, only the root bridge sends RSTP BPDUs every 'hello' interval. Why is it so?
Shouldn't all switches send BPDUs every 'hello' interval since ...
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Why does RSTP send proposal bit and agreement bit as '1' initially?
From a recent Wireshark capture of a RSTP BPDU on a switch, both proposal and agreement bits were set to '1'.
In my understanding, initially both switches 'propose' themselves as root. The better root ...
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