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GS724Tv6 and Use of STP
Hello, In a network scenario, we have total 5 Netgear switches. We have 2 GS724Tv6 switches and 3 GS724TPv3 switches. Check the topology below:
When we implemented this design, I found that only 2 data switches (DSW-1 & DSW-2) are detected and can be accessed. Downstream switches (GS724TPv3) were not able to accessed. (I connected my computer to DSW-1 through cable)
This design has switching loops for fail over and both switch models have STP enabled by default. So it should solve the loops. But we could not get GS724TP switches.
After some efforts, I disabled STP on DSW-1 and DSW-2.
So after disabling STP, GS724TP switches got the IP address from DHCP on the router and could be accessed.
So is this the best practice? Should I disable the STP on the switches?
Regards,
Sagar Patel
Taking control of STP (resp the preferred RSTP) is the key here, and not leaving the switches on the default priority.
--
DSW-1: 4096
DSW-2: 8192
--
PSW-1: 40860
PSW-2: 44965
PSW-3: 49052
--
Does that load balancer participate in STP/RSTP? If yes, enable and configure it accordingly:
--
LB: 4096
--
DSW-1: 8192
DSW-2: 12288
--
PSW-1: 40860
PSW-2: 44965
PSW-3: 49052
--
5 Replies
Taking control of STP (resp the preferred RSTP) is the key here, and not leaving the switches on the default priority.
--
DSW-1: 4096
DSW-2: 8192
--
PSW-1: 40860
PSW-2: 44965
PSW-3: 49052
--
Does that load balancer participate in STP/RSTP? If yes, enable and configure it accordingly:
--
LB: 4096
--
DSW-1: 8192
DSW-2: 12288
--
PSW-1: 40860
PSW-2: 44965
PSW-3: 49052
--
Hello schumaku
According to STP's root-Bridge Election criteria:
1. Switch with the lowest priority
2. If priority is same, switch with the lowest base MAC address
So if you check arrangement of switches here in my topology, I have placed switches accordingly.
DSW1: 54:07:7D:2D:A9:C8
DSW2: 54:07:7D:2D:AF:3C
PSW1: 54:07:7D:86:75:53
PSW2: 54:07:7D:86:7C:07
PSW3: 54:07:7D:86:F2:A2
Load Balancer Router: A8-6E-84-21-99-56
Based on this, DSW1 should be root-bridge. So is this mandatory to change the priority of the switches?
And if I remove, load balancer router from the topology (considering it does not participate in STP), still have I to change the priorities?
Regards,
Sagar Patel
samarthengineer wrote:
Based on this, DSW1 should be root-bridge. So is this mandatory to change the priority of the switches?
Yes, you are on the controls - I'm not.
Strongly suggest to take control of (R)STP priorities, see my basic (R)STP proposal(s) for your environment. It's not complex, but for my part I would never depend on the default STP setting -and- "lowest MAC" [a standard in (R)STP].
There was a lengthy thread (not covering such a redundant network setting when I remember right) years ago here worth reading and understanding by Jedi_Exile (hope he is still around 8-) ). For most "simple" networks, deploying (R)STP is sufficient, especially in case you are unsure about the other devices (like other brand switches, load balancer, ....).
Sure, more sophisticated designs can be considered, including MSTP based approaches - all this requires -full- control and -knowledge- over almost everything. That's what we as network engineers are paid for, including experience, ... because our manager and Cxx level leaders depend on us. (My best wife would love to hear that, and so do all my customers CEOs)
hello, I have a query for my knowledge. In my current scenario, we have 5 switches and I configured priority manually on all 5 switches. What if we have more than 10 numbers of switches in network.! ?.
We can set the priority in multiple of 4096 only so we have limited options. So what can we do in such a case.? Is that depends on switch network topology.?
With regards,Sagar Patel
A more sophisticated approach would be to set the switches in the same "level" to the same priority, like
--
LB: 4096
--
DSW-1: 8192
DSW-2: 8192
--
PSW-1: 12228
PSW-2: 12228
PSW-3: 12228
--
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