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Loop detection on 5120-SI switches

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LS1971
Frequent Advisor

Loop detection on 5120-SI switches

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

Regards, Leonardo
2 REPLIES
manuel.bitzi
Trusted Contributor
Solution

Re: Loop detection on 5120-SI switches

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

H3CSE, MASE Network Infrastructure [2011], Switzerland
LS1971
Frequent Advisor

Re: Loop detection on 5120-SI switches

Hi Manuel,

 

thank you!

 

Regards, Leonardo

Regards, Leonardo