Looking a bit more explanation about the SG-3100 and STP
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As per the documentation .
Does the interconnected switches mean if I have this setup: Pfsense LAN1> SW1 > SW2. This could create a flooding loop? If yes, is there another Negate device that support this config?
Thanks
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@swygue said in Looking a bit more explanation about the SG-3100 and STP:
Does the interconnected switches mean if I have this setup: Pfsense LAN1> SW1 > SW2.
Hi,
STP is a protocol which operating in the L2 (OSI) layer and fit for larger systems (many switches).
By calculating the best "spanning-tree" this prevents the formation of unnecesary loops. (and at the same time "backup" routes can be formed = redundancy)Due to the above, this can be applied in the L2 layer rather than in L3, so they do not play a role in the life of routers.
Moreover, they can cause the problems described in the documentation.
for example:
When connecting a new port, the STP has a learning time interval (20 - 40 sec), and this may cause other services to time out (f.e.: DHCP)if you operate such networks,....
mesh and ad-hoc networks, it may be advantageousSo unnecessary for the -router + 2 switches- which is outlined in your case,
rather, the physical connections should be well designed to prevent the formation of an ethernet loopit can be used well for understanding (interconnected switches):
https://community.fs.com/blog/how-to-connect-multiple-ethernet-switches.html
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@DaddyGo thank you.
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It means if you connected LAN ports 1 and 2 to the same switch you would create a loop. Unless, for example, those ports were configured as different segments via VLANs in the SG-3100.
The internal switch that is connected to LAN ports 1-4 does not support Spanning Tree Protocol that could otherwise prevent that.
It's not something that commonly happens, I'm not sure we've ever seen a ticket for that.
Steve
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@swygue said in Looking a bit more explanation about the SG-3100 and STP:
thank you.
You Welcome...
It's just a network building question....
The switches in the L2 layer should be allowed to work with the STP, RSTP, MSTP stuff, this should not be of interest to a switch built into a router...?!?
(your home network does not need this)In a SOHO environment, a switch chip in the router may be beneficial, but then let’s not talk about STP
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@stephenw10 said in Looking a bit more explanation about the SG-3100 and STP:
It means if you connected LAN ports 1 and 2 to the same switch you would create a loop. Unless, for example, those ports were configured as different segments via VLANs in the SG-3100.
The internal switch that is connected to LAN ports 1-4 does not support Spanning Tree Protocol that could otherwise prevent that.
It's not something that commonly happens, I'm not sure we've ever seen a ticket for that.
Steve
Thanks, Steve. Just so this is clear. My LAN ports 1-4 are all on the same segments. Are you saying I can connect SW1 to LAN1 and SW2 to LAN2?
Based on @DaddyGo feedback i was going to connect SW1 to LAN1 and SW2 to SW1. I do use VLANS, so i can configure one of the LAN ports to be on it's own segment.
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@swygue said in Looking a bit more explanation about the SG-3100 and STP:
i was going to connect SW1 to LAN1 and SW2 to SW1.
I would also note that try to keep the uplink strategy, where possible use the designated port (uplink) for switches
https://community.fs.com/blog/switch-stacking-vs-trunking-vs-uplink-which-is-best-to-connect-switches.html
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@swygue said in Looking a bit more explanation about the SG-3100 and STP:
Are you saying I can connect SW1 to LAN1 and SW2 to LAN2?
Yes. As long as switch 1 is not also connected directly to switch 2 you will not have a loop.
Steve
