To remove err-disable state you need to prune vlan 12. in earlier task( R1, R2 and BB1 task ) we have used vlan 12 for tunneling.When switches with l2protocol tunneling receive a frame it will send frame to Cisco proprietary MAC address.One of the rules for Q-Q tunneling is that if you have a port configured for l2protocol tunnel then you may not receive this frame destined for Cisco proprietary MAC address and thats why port goes to err-disable. it is bit confusing but hope this will help you and I think same details is in Tyson's article.
2 cents.. Thanks Nilesh On Sun, Dec 26, 2010 at 2:06 PM, Michael Smith <[email protected]> wrote: > > Hey guys I am having some problems with Lab 5 and doing switch-to-switch > Q-in-Q tunneling. This is the configuration I have so far on the client > switch; > > switchport trunk encapsulation dot1q > switchport mode trunk > switchport trunk native vlan 990 > switchport trunk allowed vlan 990 > > > And here is the configuration on the service provider switch; > > > switchport access vlan 990 > switchport mode dot1q-tunnel > l2protocol-tunnel cdp > l2protocol-tunnel stp > l2protocol-tunnel vtp > no cdp enable > > I am continuously getting the l2protocol tunnel errors which place my > interface into errdisable. Is there anything I'm missing to the > configuration? Also in the Detailed Solution guide the configuration of the > client switches is not even included. I looked it up in the Doc CD on > cisco.com and there is nothing on this error I am getting. Also in > detailed solution guide it said to prune vlan 12 from the trunk links. But > when I do that it doesn't even do anything. I'm still trying to understand > why I would prune vlan 12 when it doesn't have anything to do with my > configuration. Thanks in advance for your help. > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
