Questions tagged [ieee-802.1s]
For questions about MST (Multiple Spanning Tree Protocol).
22
questions
0
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0
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30
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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 ...
- 11
1
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0
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55
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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 ...
- 11
1
vote
1
answer
78
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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 ...
- 11
2
votes
2
answers
218
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MST - multiple instance design in single region
I am preparing for migration of this rather simple network layout from RST to MST:
From what I have read so far, it looks like the best approach is to avoid interoperability issues and simply rollout ...
- 176
3
votes
1
answer
2k
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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 ...
- 33
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2
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427
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RSTP Separation
Topology:
(Ring Network A)----[Router A]-------(Possibly Ring Network C)-------[Router B]----(Ring Network B)
Goals
I need Router A to always be the RSTP root bridge for Network A.
I need Router B to ...
- 1
1
vote
1
answer
235
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how ieee 802.11s does channel switching? is it supported?
I'm studying about IEEE 802.11s wireless mesh networks
every where on documents i read is pointed that all Mesh Point must be on same channel for discovery and peering.
But i can't find anything about ...
- 153
0
votes
1
answer
1k
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Layer 2 redundant network and OSPF
What is a recommended way (in terms of maintenance, simplicity and failsafe-ness) to essentially run a "ring" of switches, but allowing OSPF to run properly (so equal-cost-path routing can work - in ...
- 66
1
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3
answers
1k
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STP Priority field and 4 bits in multiples of 4096
For the STP Priority Field, how do you get "multiples of 4096" out of 4 bits?
2
votes
2
answers
921
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Spanning tree Priority values
show spanning-tree interface gigabitethernet 0/2
Switch default
Instance Role State Cost Prio type
-------- ---- ----- ---- ---- ----
MST00 ...
- 59
1
vote
1
answer
3k
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Spanning-tree MSTR port role
What is the MSTR port role in Spanning-tree ?
It shows up on boundary ports between MST regions and switches running (R)PVST+. Note that it shows up only on the switches running MST.
It seems to ...
- 590
5
votes
1
answer
854
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Is Per Vlan Spanning Tree or RPVST an open standard or can it only be implemented by Cisco?
I know there are some standards that are CISCO proprietary but have become open standards. CISCO has also updated the RFC to reflect this. So, is this also true for PVST?
Does Juniper or other ...
- 181
2
votes
1
answer
79
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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 ...
- 35
3
votes
2
answers
590
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MSTP - different VLAN mapping in different regions
Regarding MSTP, is it possible to have different VLAN mapping for different regions ?
Example:
Region 1:
Instance 1: VLAN 10,20,30
Instance 2: VLAN 40,50,60
Region 2:
Instance 1: VLAN 10,50,60
...
- 1,085
2
votes
4
answers
749
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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
...
- 787
1
vote
2
answers
541
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MST region and CST virtual bridge priority
In Multiple Spanning Tree, 802.1s, an MST region appears to the external world (another MST region, a 802.1d or 802.1w switch) as a single (virtual) bridge, using its IST instance.
What is the ...
- 19.8k
4
votes
2
answers
3k
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Spanning-Tree Interoperability between ProCurve core & Cisco access layer
I need help regarding the following spanning-tree issue.
I have a network core of 2 HP5412 (procurve) connected together using VRRP over a L2 tagged link.
I have a Cisco 3560 connected to each of the ...
- 787
3
votes
1
answer
1k
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Multiple Spanning-Tree. Same VLANs on instance for all switches?
I have a quick question regarding MSTP:
Do all the switches in an MSTP domain should agree to which VLANs are mapped to an instance?
Being that dumb, I've just caused an outage by just simply ...
- 837
3
votes
1
answer
279
views
MSTP with no single point of failure with 4 switches and 2 regions
I'm trying to come up with a plan to get our core network design a bit more resilient to failure.
Here is a drawing of what I would like to achieve:
The final design would probably involve one more ...
- 422
4
votes
1
answer
397
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Can MSTP (802.1s) be used to emulate Rapid-PVST?
It is said that MSTP is used to group VLANs for different logical topologies. Can it be used to group individual VLANs (one VLAN per group) to imitate the behavior of Cisco's Rapid PVST (unique ...
- 927
3
votes
1
answer
4k
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Easy PVST to MST transition
I have a scenario of six switches (C2960S, Version 12.2) running out of PVST instances so a transition to MST is inevitable. Seeing how small scale the setup is, I assume I could shut a few links to ...
- 171
11
votes
1
answer
4k
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How can I make a PVST+ switch root towards MST network?
In a network where the majority of the switches are running MST but a select few are still running PVST+, how can the PVST+ switch be configured to be the root of the spanning tree? Topology below:
+-...
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