Inter-VLAN loop

Unanswered Question
Feb 16th, 2009

How can I avoid loop between two different VLANs. I have already activated RPVST+ on all the switches.

I have this problem too.
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ccannon88567 Tue, 02/17/2009 - 02:46

What makes you think that you have a L2 loop?

RPVST+ and PVST+ should prevent this? It may be that you have some incorrect additional fine tuning STP statements such as port fast applied incorrectly?

Dorwin Caballero Tue, 02/17/2009 - 05:02

Hi, the problem is like this, one port is switchport access vlan 10 was accidentally connected to a patch panel connected to switchport accesds vlan 20. The network went down and the error loopback was detected. We have around 20 VLANs on our core/L3 switch.

Skjalg Eggen Thu, 11/04/2010 - 03:35

Port security on access ports should do the trick.

The problem still exists, however, if you have trunk ports configured for your IP-Phones and some user decides to plug the PC end of the phone back into the other patch in the wall. This is bad. And I have yet to find a good solution to this problem.

Inter-VLAN loops on trunk ports. Possibly storm-control could be of some help?


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