09-17-2012 04:04 AM - edited 03-04-2019 05:35 PM
Hi All,
Can someone advise me if i can setup STP on a 3560X switch working as L2/L3 same time? There are VLANs configured on the ports and the switch is using EIGRP for routing.
Thank you all in advance.
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09-17-2012 04:46 AM
Hello Akbar,
you can and you should use an STP flavor on your multilayer switch, because STP manages link redundancy at OSI layer 2, it does a different job that it is not performed by an IP routing protocol like EIGRP.
To make an example it is STP and its safety measures like Bpduguard that allows to avoid to melt down the network if by user error two switch ports are connected together.
PVST+ should be enough, configure your switch to be the primary root bridge for all Vlans, and use Bpduguard on all user facing ports.
Hope to help
Giuseppe
09-17-2012 05:17 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Like Giuseppe, I too would recommend keeping STP active in case of accidental L2 loops.
You can make portfast and bpduguard the default for ordinary edge switchports with these two global commands:
spanning-tree portfast default
spanning-tree portfast bpduguard default
09-17-2012 04:46 AM
Hello Akbar,
you can and you should use an STP flavor on your multilayer switch, because STP manages link redundancy at OSI layer 2, it does a different job that it is not performed by an IP routing protocol like EIGRP.
To make an example it is STP and its safety measures like Bpduguard that allows to avoid to melt down the network if by user error two switch ports are connected together.
PVST+ should be enough, configure your switch to be the primary root bridge for all Vlans, and use Bpduguard on all user facing ports.
Hope to help
Giuseppe
09-17-2012 05:17 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Like Giuseppe, I too would recommend keeping STP active in case of accidental L2 loops.
You can make portfast and bpduguard the default for ordinary edge switchports with these two global commands:
spanning-tree portfast default
spanning-tree portfast bpduguard default
09-17-2012 06:05 AM
STP should already be running unless you explicitly disabled it.
If you did and you reenable it and you have multiple switches be aware that you amy experience a short outage while STP converges.
Jon
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