Almost 9 years ago to the day and your videos continue to help others? Great job! I had a student stuck and I couldn't get him out. But I found this video and your explanation did the trick! Thank you! John
@fumega You can do that to enable a type of load-balancing but you are not adding more bandwidth per vlan. You still have 1 interface forwarding and 1 interface blocking per VLAN. If I leave the defaults I have Fa0/23 forwarding and Fa0/24 blocking for both VLANs. If we change the port-priority of Fa0/24 of Cat1 for only VLAN 2 you would have Fa0/23 forwarding for VLAN 1 and blocking for VLAN2 and Fa0/24 blocking for VLAN1 and forwarding for VLAN2 on Cat2
@astorinonetworks 1Hi Astorino. First thank you for you fast reply. When I said that we would have more bandwidth per Vlan, I was referring to the fact that with the default STP port Fa0/24 on CAT2 would be blocked for all Vlans, and Fa0/23 would be the forwarding for all vlans (root). So if we changed the priority for Vlan, let's say, 6, on Fa0/24 of CAT2, Fa0/24 would become the root of CAT2, and Fa0/23 would be ALTN blocked for Vlan6. So we would have the Fa0/24 only for Vlan6 and Fa0/23
Very good explanation, i was stuck for an hour trying to find why changing local port priority doesn't affect how a switch choose designating port on my topology
(2) unchanged, than we would have the Fa0/24 of Cat2 being the root for Vlan 2 and Fa0/23 being the root for Vlan 1 right? This design would allow more bandwidth per Vlan.
Great video and thank you. I figured you can load balance by just switching which vlan you want the root bridge to operate on. I suppose this is easier. Do you think changing port priority is simpler and cleaner when controlling or load balancing your Layer 2 architecture?
Very good explanation. Much thanks. It has been a long time since I needed to do this and the refresher is great. I am actually using Brocade switches, but spanning-tree is spanning-tree.
@astorinonetworks 2 only for vlan 1. So every Vlan would have its own 1Gb/s port vs 1Gb/s shared port. I don't know if this works in production, that why I'm asking ;-) Regards.
(1) Hello. I've just discovered your website and RUclips videos, they're amazing! By the way, we can take advantage of this feature in order to increase the available bandwidth per Vlan right? For instance, if there were two vlans, 1 and 2, by default all switches would have the same forwarding and blocking ports for all vlans. But if we changed the port-priority of VLan 2 on Fa0/24 of CAT 1 to, let's say, 32 (spanning-tree vlan 5 port-priority 32) and left the vlan 1 port priority
Part of what you said is right : ) -- Changing the port-priority on Cat2 fa0/24 will not change anything. It will not make Cat2 Fa0/24 the root port of Cat2. You would have to change port-priority on Cat1 Fa0/24 as I did in the video to make that happen. On Cat2 if you have fa0/23 the root port for VL2 and F0/24 the root for VL6 then yes you could do what you are talking about. To make that happen though you either need to change port-priority on Cat1 or spanning-tree port cost on Cat2
Thanks for the explanation. One thing that puzzles me in this video is, designated port physical identifier. It is clearly not a stackwise or modular switch platform, all the ports should have 128.portnum pair as their identifier. Yet on the Cat1 for example, Fa0/23 detail output shows designated port is learned as 128.*25*
This was done on a Cisco 3560-24 switch. This particular model has 24x FastEthernet interfaces and 2x GigabitEthernet interfaces. On that platform, the two GigabitEthernet interfaces take port identifiers 128.1 and 128.2. Thus Fa0/1 = 128.3, etc
There are several REASONS why professional recordings are performed in studios with voice actors who take and retake segments, use noise filters, etc and among those reasons is MANY people do NOT want to hear lip smacking or slurping noises, heavy breathing cause you smoke or your lungs are otherwise constricted, or the residual saliva or phlegm in your mouth when you make your hard Cs in words like "cost". I wish I could have watched this whole video but I cannot as I am utterly disgusted.
Almost 9 years ago to the day and your videos continue to help others? Great job! I had a student stuck and I couldn't get him out. But I found this video and your explanation did the trick! Thank you! John
Now I understood the root port election, Thank you very much.
Perfect explanation ! it's help me a lots.....
Simply understandable way of explanation. You solved my problem. Thanks.
I was looking for this information since last couple of days. Excellent explanation.
Great explanation
Well explained. Great video. Thank you!
Thanks for this video. Explained simply and understood
This topic is well explain in the easies way possible, many thanks - I have subscribe for all your post
@fumega You can do that to enable a type of load-balancing but you are not adding more bandwidth per vlan. You still have 1 interface forwarding and 1 interface blocking per VLAN.
If I leave the defaults I have Fa0/23 forwarding and Fa0/24 blocking for both VLANs. If we change the port-priority of Fa0/24 of Cat1 for only VLAN 2 you would have Fa0/23 forwarding for VLAN 1 and blocking for VLAN2 and Fa0/24 blocking for VLAN1 and forwarding for VLAN2 on Cat2
@astorinonetworks
1Hi Astorino.
First thank you for you fast reply.
When I said that we would have more bandwidth per Vlan, I was referring to the fact that with the default STP port Fa0/24 on CAT2 would be blocked for all Vlans, and Fa0/23 would be the forwarding for all vlans (root). So if we changed the priority for Vlan, let's say, 6, on Fa0/24 of CAT2, Fa0/24 would become the root of CAT2, and Fa0/23 would be ALTN blocked for Vlan6. So we would have the Fa0/24 only for Vlan6 and Fa0/23
Crystal clear, thanks!
Awesome simple clear explanation. Thank you!
It was really 🔮 clear thank you so much.
Really good explanation! Thanks for uploading :)
Very good explanation, i was stuck for an hour trying to find why changing local port priority doesn't affect how a switch choose designating port on my topology
Thanks, very simple and clear to the point.
(2)
unchanged, than we would have the Fa0/24 of Cat2 being the root for Vlan 2 and Fa0/23 being the root for Vlan 1 right? This design would allow more bandwidth per Vlan.
Great video and thank you. I figured you can load balance by just switching which vlan you want the root bridge to operate on. I suppose this is easier. Do you think changing port priority is simpler and cleaner when controlling or load balancing your Layer 2 architecture?
Very clear explanation thank you
Very good explanation. Much thanks. It has been a long time since I needed to do this and the refresher is great. I am actually using Brocade switches, but spanning-tree is spanning-tree.
Cool. Glad you enjoyed the video
@astorinonetworks
2 only for vlan 1. So every Vlan would have its own 1Gb/s port vs 1Gb/s shared port.
I don't know if this works in production, that why I'm asking ;-)
Regards.
(1) Hello.
I've just discovered your website and RUclips videos, they're amazing!
By the way, we can take advantage of this feature in order to increase the available bandwidth per Vlan right? For instance, if there were two vlans, 1 and 2, by default all switches would have the same forwarding and blocking ports for all vlans. But if we changed the port-priority of VLan 2 on Fa0/24 of CAT 1 to, let's say, 32 (spanning-tree vlan 5 port-priority 32) and left the vlan 1 port priority
Excellent Video !!!!!!!
Part of what you said is right : ) -- Changing the port-priority on Cat2 fa0/24 will not change anything. It will not make Cat2 Fa0/24 the root port of Cat2. You would have to change port-priority on Cat1 Fa0/24 as I did in the video to make that happen.
On Cat2 if you have fa0/23 the root port for VL2 and F0/24 the root for VL6 then yes you could do what you are talking about. To make that happen though you either need to change port-priority on Cat1 or spanning-tree port cost on Cat2
Thanks, great video and I thought that there will be a mishmash or a loop if the priority was different on 2 directly connected ports :)
I wish you would have explained how to determine the priority value to use.
Very much helpful thanks.
clears up a lot of stuff about STP, thanks
Thanks a million Joe
Found an explaination on youtube video "Spanning-tree, intermediate level " by Keith Barker, at around minute 12!
Thanks for the explanation.
One thing that puzzles me in this video is, designated port physical identifier. It is clearly not a stackwise or modular switch platform, all the ports should have 128.portnum pair as their identifier. Yet on the Cat1 for example, Fa0/23 detail output shows designated port is learned as 128.*25*
I'd like to know the answer to this question as well.
This was done on a Cisco 3560-24 switch. This particular model has 24x
FastEthernet interfaces and 2x GigabitEthernet interfaces. On that
platform, the two GigabitEthernet interfaces take port identifiers 128.1
and 128.2. Thus Fa0/1 = 128.3, etc
Thanks, it's clear now :)
Great thanks!
Great explanation. Thanks a lot (Y)
Thanks
Yep, I didn't get it either!
@bagojunk2 Solution: don't watch the video and go learn STP from somebody else.
There are several REASONS why professional recordings are performed in studios with voice actors who take and retake segments, use noise filters, etc and among those reasons is MANY people do NOT want to hear lip smacking or slurping noises, heavy breathing cause you smoke or your lungs are otherwise constricted, or the residual saliva or phlegm in your mouth when you make your hard Cs in words like "cost". I wish I could have watched this whole video but I cannot as I am utterly disgusted.
Great! Thank you