Topology Change and Switching Loop
I believe I posted a question in the recent past about a problem that happened in the Network.
A Vendor connected a server blades Chassis (Which has an internal Switch) that caused I believe a change in topology or less likely a Switching loop, since our company has a Network in SiteA and another failover Network in Site B (in case of Natural Catastrophe).
**Le 's start with topology change, I believe this can happen only if the Root Bridge is not already configured in the Network, the Root is determined by the oldest Mac address, or the lowest priority or manually configured as Root primary.
Correct?
I believe the only way to fix the topology Change is to go to the switch you want to be the Root and make it Primary
**Switching Loop
The only way in the scenario described above, that might have caused the Loop, could be if the Vendor has connected 2 ports from the blade chassis to 2 different ports on the same switch or on 2 ports on 2 different switches
I am not sure how you can fix a switching loop when it happens, even when STP is enabled
Any insights on this question are welcomed.
Thanks
A Vendor connected a server blades Chassis (Which has an internal Switch) that caused I believe a change in topology or less likely a Switching loop, since our company has a Network in SiteA and another failover Network in Site B (in case of Natural Catastrophe).
**Le 's start with topology change, I believe this can happen only if the Root Bridge is not already configured in the Network, the Root is determined by the oldest Mac address, or the lowest priority or manually configured as Root primary.
Correct?
I believe the only way to fix the topology Change is to go to the switch you want to be the Root and make it Primary
**Switching Loop
The only way in the scenario described above, that might have caused the Loop, could be if the Vendor has connected 2 ports from the blade chassis to 2 different ports on the same switch or on 2 ports on 2 different switches
I am not sure how you can fix a switching loop when it happens, even when STP is enabled
Any insights on this question are welcomed.
Thanks
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Most of Reading , I have done about STP and Switching loops, they talk about enabling STP to prevents loops.
STP is enabled by default, but still loops happen in many networks. the one thing they do not mention is the case by case that can cause a loop even with STP on,
other pro-active measures to take to prevent switching loops.. I know you mentioned Disable all unused ports, but before they use the unused ports either for trunking or access ports or etherchannel, what are the measures they should take ?
STP is enabled by default, but still loops happen in many networks. the one thing they do not mention is the case by case that can cause a loop even with STP on,
other pro-active measures to take to prevent switching loops.. I know you mentioned Disable all unused ports, but before they use the unused ports either for trunking or access ports or etherchannel, what are the measures they should take ?
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Thank you Guys!
ASKER
To prevent switching loop, you said you disable unused ports ... is it rule of thumb.?.....most of environments do not.
If I understand switching loops are prevented by STP, but even when STP is on , switching loops can happen. in this case are they caused by bad wiring ? if so, what is the bad wiring that can cause the switching loop?, for instance plugging 2 ends of a Cable to 2 ports on the same switch will cause a loop? what else can cause a loop ?