Loop detection on 5120-SI switches

[LS1971]

Hi!

Recently we had a loop in one of our VLANs in our HP based network (10500 core-switches, 5120-SI access switches). Someone connected an unmanaged switch to two access ports of the same 5120-SI switch. This caused the broadcast packets to loop and consume bandwidth...

The configuration of the 5120-SI switches includes

 stp bpdu-protection

 stp enable

and for the GigabitEthernet interfaces

 port access vlan X
 stp edged-port enable

What do I need to configure to prevent such a user-caused loop to happen again? I though of using storm-constrain or stp loop-guard. Is there a best-practices guide for these features (for example, how many pps to use for storm-constrain) or is anyone here in the community already using this features and could post a working config?

Thanks!

Regards,

Leonardo

[manuel.bitzi · Accepted solution]

loopback-detection multi-port would be your soltution

loopback-detection enable

loopback-detection multi-port-mode enable

interf giga x/y/z

 loopback-detection enable

br

Manuel

[LS1971]

Hi Manuel,

thank you!

Regards, Leonardo