Spanning tree Priority valuesSpanning tree questionSpanning tree Default Priority ValuesWhy showing IEEE...
Can a planet be tidally unlocked?
Sets which are both Sum-free and Product-free.
Buying a "Used" Router
Variance of sine and cosine of a random variable
How many copper coins fit inside a cubic foot?
Was Opportunity's last message to Earth "My battery is low and it's getting dark"?
How can I persuade an unwilling soul to become willing?
What does it mean when an external ID field follows a DML Statement?
Why Third 'Reich'? Why is 'reich' not translated when 'third' is? What is the English synonym of reich?
Why do we interpret the accelerated expansion of the universe as the proof for the existence of dark energy?
Exploding Numbers
3D buried view in Tikz
What does "don't have a baby" imply or mean in this sentence?
Is there a way to pause a running process on Linux systems and resume later?
Coworker is trying to get me to sign his petition to run for office. How to decline politely?
Minimum energy path of a potential energy surface
How do I write a maintainable, fast, compile-time bit-mask in C++?
Build ASCII Podiums
Why are "square law" devices important?
Is Screenshot Time-tracking Common?
How do I avoid the "chosen hero" feeling?
Checking if an integer permutation is cyclic in Java
Why do single electrical receptacles exist?
When distributing a Linux kernel driver as source code, what's the difference between Proprietary and GPL license?
Spanning tree Priority values
Spanning tree questionSpanning tree Default Priority ValuesWhy showing IEEE Spanning Tree protocolhow to read the STP status (FORWARD/BLOCKING) of each interface/port via SNMPHow does STP calculate the lowest port IDCisco STP issue with BIG IP F5 trunkspanning tree, how can I change the path?Finding the optimum root bridge for a spanning treeSpanning tree - port roles and status during root bridge electionSpanning tree behaviour - topology change
show spanning-tree interface gigabitethernet 0/2
Switch default
Instance Role State Cost Prio type
-------- ---- ----- ---- ---- ----
MST00 Designated Forwarding 20000 128.2 P2P
MST01 Designated Forwarding 20000 128.2 P2P
MST02 Designated Forwarding 20000 128.2 P2P
How the value 128.2 is calculated?
switching spanning-tree ieee-802.1s
edited 1 hour ago
Cown
6,26131030
asked 1 hour ago
kamakshikamakshi
111
New contributor
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
show spanning-tree interface gigabitethernet 0/2
Switch default
Instance Role State Cost Prio type
-------- ---- ----- ---- ---- ----
MST00 Designated Forwarding 20000 128.2 P2P
MST01 Designated Forwarding 20000 128.2 P2P
MST02 Designated Forwarding 20000 128.2 P2P
How the value 128.2 is calculated?
switching spanning-tree ieee-802.1s
edited 1 hour ago
Cown
6,26131030
asked 1 hour ago
kamakshikamakshi
111
New contributor
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
show spanning-tree interface gigabitethernet 0/2
Switch default
Instance Role State Cost Prio type
-------- ---- ----- ---- ---- ----
MST00 Designated Forwarding 20000 128.2 P2P
MST01 Designated Forwarding 20000 128.2 P2P
MST02 Designated Forwarding 20000 128.2 P2P
How the value 128.2 is calculated?
switching spanning-tree ieee-802.1s
edited 1 hour ago
Cown
6,26131030
asked 1 hour ago
kamakshikamakshi
111
New contributor
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
show spanning-tree interface gigabitethernet 0/2
Switch default
Instance Role State Cost Prio type
-------- ---- ----- ---- ---- ----
MST00 Designated Forwarding 20000 128.2 P2P
MST01 Designated Forwarding 20000 128.2 P2P
MST02 Designated Forwarding 20000 128.2 P2P
How the value 128.2 is calculated?
switching spanning-tree ieee-802.1s
switching spanning-tree ieee-802.1s
edited 1 hour ago
Cown
6,26131030
asked 1 hour ago
kamakshikamakshi
111
New contributor
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 1 hour ago
Cown
6,26131030
asked 1 hour ago
kamakshikamakshi
111
New contributor
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 1 hour ago
Cown
6,26131030
edited 1 hour ago
Cown
6,26131030
edited 1 hour ago
Cown
6,26131030
6,26131030
asked 1 hour ago
kamakshikamakshi
111
New contributor
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
kamakshikamakshi
111
asked 1 hour ago
kamakshikamakshi
111
111
New contributor
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
kamakshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
128 is the default bridge priority. 2 is the port number and its default priority.
STP always chooses the bridge or port with the lowest number = highest priority. Paths to bridges with higher numbers are blocked. Put another way, the bridge with the overall lowest priority number is elected as root bridge. All ports leading to the root bridge are compared by their cost (lowest cost is chosen) and when there's a tie between bridges, the path to the bridge with the lowest priority number is chosen.
When there's a tie between ports (=two ports connecting to the same bridge) the ports' priorities are used.
Note that in both bridge and port priorities, the configured priority is prepended to the bridges MAC address or the port number. So, even with identical configured priorities there can never be a tie between bridges or ports as each hardware number is unique.
answered 42 mins ago
Zac67Zac67
29.7k21859
add a comment |
128 is the default port priority (not cost) for xSTP interfaces, and .2 is the port number (eg: gi0/2).
In short, all things being equal (and in their default state), if two switches have multiple links joining them together, the lowest physical port number will generate the lowest port priority, and hence become the preferred root port.
answered 58 mins ago
Benjamin DaleBenjamin Dale
6,9541036
Thanks for Info.
– kamakshi
40 mins ago
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "496"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
kamakshi is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fnetworkengineering.stackexchange.com%2fquestions%2f57144%2fspanning-tree-priority-values%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
128 is the default bridge priority. 2 is the port number and its default priority.
STP always chooses the bridge or port with the lowest number = highest priority. Paths to bridges with higher numbers are blocked. Put another way, the bridge with the overall lowest priority number is elected as root bridge. All ports leading to the root bridge are compared by their cost (lowest cost is chosen) and when there's a tie between bridges, the path to the bridge with the lowest priority number is chosen.
When there's a tie between ports (=two ports connecting to the same bridge) the ports' priorities are used.
Note that in both bridge and port priorities, the configured priority is prepended to the bridges MAC address or the port number. So, even with identical configured priorities there can never be a tie between bridges or ports as each hardware number is unique.
answered 42 mins ago
Zac67Zac67
29.7k21859
add a comment |
128 is the default bridge priority. 2 is the port number and its default priority.
STP always chooses the bridge or port with the lowest number = highest priority. Paths to bridges with higher numbers are blocked. Put another way, the bridge with the overall lowest priority number is elected as root bridge. All ports leading to the root bridge are compared by their cost (lowest cost is chosen) and when there's a tie between bridges, the path to the bridge with the lowest priority number is chosen.
When there's a tie between ports (=two ports connecting to the same bridge) the ports' priorities are used.
Note that in both bridge and port priorities, the configured priority is prepended to the bridges MAC address or the port number. So, even with identical configured priorities there can never be a tie between bridges or ports as each hardware number is unique.
answered 42 mins ago
Zac67Zac67
29.7k21859
add a comment |
128 is the default bridge priority. 2 is the port number and its default priority.
STP always chooses the bridge or port with the lowest number = highest priority. Paths to bridges with higher numbers are blocked. Put another way, the bridge with the overall lowest priority number is elected as root bridge. All ports leading to the root bridge are compared by their cost (lowest cost is chosen) and when there's a tie between bridges, the path to the bridge with the lowest priority number is chosen.
When there's a tie between ports (=two ports connecting to the same bridge) the ports' priorities are used.
Note that in both bridge and port priorities, the configured priority is prepended to the bridges MAC address or the port number. So, even with identical configured priorities there can never be a tie between bridges or ports as each hardware number is unique.
answered 42 mins ago
Zac67Zac67
29.7k21859
128 is the default bridge priority. 2 is the port number and its default priority.
STP always chooses the bridge or port with the lowest number = highest priority. Paths to bridges with higher numbers are blocked. Put another way, the bridge with the overall lowest priority number is elected as root bridge. All ports leading to the root bridge are compared by their cost (lowest cost is chosen) and when there's a tie between bridges, the path to the bridge with the lowest priority number is chosen.
When there's a tie between ports (=two ports connecting to the same bridge) the ports' priorities are used.
Note that in both bridge and port priorities, the configured priority is prepended to the bridges MAC address or the port number. So, even with identical configured priorities there can never be a tie between bridges or ports as each hardware number is unique.
answered 42 mins ago
Zac67Zac67
29.7k21859
answered 42 mins ago
Zac67Zac67
29.7k21859
answered 42 mins ago
Zac67Zac67
29.7k21859
answered 42 mins ago
Zac67Zac67
29.7k21859
29.7k21859
add a comment |
add a comment |
128 is the default port priority (not cost) for xSTP interfaces, and .2 is the port number (eg: gi0/2).
In short, all things being equal (and in their default state), if two switches have multiple links joining them together, the lowest physical port number will generate the lowest port priority, and hence become the preferred root port.
answered 58 mins ago
Benjamin DaleBenjamin Dale
6,9541036
Thanks for Info.
– kamakshi
40 mins ago
add a comment |
128 is the default port priority (not cost) for xSTP interfaces, and .2 is the port number (eg: gi0/2).
In short, all things being equal (and in their default state), if two switches have multiple links joining them together, the lowest physical port number will generate the lowest port priority, and hence become the preferred root port.
answered 58 mins ago
Benjamin DaleBenjamin Dale
6,9541036
Thanks for Info.
– kamakshi
40 mins ago
add a comment |
128 is the default port priority (not cost) for xSTP interfaces, and .2 is the port number (eg: gi0/2).
In short, all things being equal (and in their default state), if two switches have multiple links joining them together, the lowest physical port number will generate the lowest port priority, and hence become the preferred root port.
answered 58 mins ago
Benjamin DaleBenjamin Dale
6,9541036
128 is the default port priority (not cost) for xSTP interfaces, and .2 is the port number (eg: gi0/2).
In short, all things being equal (and in their default state), if two switches have multiple links joining them together, the lowest physical port number will generate the lowest port priority, and hence become the preferred root port.
answered 58 mins ago
Benjamin DaleBenjamin Dale
6,9541036
answered 58 mins ago
Benjamin DaleBenjamin Dale
6,9541036
answered 58 mins ago
Benjamin DaleBenjamin Dale
6,9541036
answered 58 mins ago
Benjamin DaleBenjamin Dale
6,9541036
6,9541036
Thanks for Info.
– kamakshi
40 mins ago
add a comment |
Thanks for Info.
– kamakshi
40 mins ago
Thanks for Info.
– kamakshi
40 mins ago
Thanks for Info.
– kamakshi
40 mins ago
add a comment |
kamakshi is a new contributor. Be nice, and check out our Code of Conduct.
kamakshi is a new contributor. Be nice, and check out our Code of Conduct.
kamakshi is a new contributor. Be nice, and check out our Code of Conduct.
kamakshi is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Network Engineering Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fnetworkengineering.stackexchange.com%2fquestions%2f57144%2fspanning-tree-priority-values%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
