cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
519
Views
0
Helpful
3
Replies

STP on L2/L3 switches

AkbarAliSheikh
Beginner
Beginner

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.

2 Accepted Solutions

Accepted Solutions

Giuseppe Larosa
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

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

View solution in original post

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

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

View solution in original post

3 Replies 3

Giuseppe Larosa
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

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

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

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

Jon Marshall
VIP Community Legend VIP Community Legend
VIP Community Legend

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

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: