What is the behavior a PVST environment when a router "sub-interface" configured with a particular VLAN is shutdown/brought up. The router connects to a c2950 dot1Q trunk port configured for few VLANs.
When there's a change of the physical interface state(up/down) I see the STP state transition. However the change of status of sub-interface has no impact on STP status of the connected switch interface(remains in forwarding even for the disabled VLAN).
How is this behavior explained? Have I overlooked something here?
Re: Question on PVST & router sub-interface status
The difference is at the switch' side. The switch has no way to know the status of a sub-interface on a connected device when it does not receive bpdu's from it. As long as the vlan is allowed on the trunk, all traffic for it will be forwarded. (either broad-, multi- or unicast) The receiving end will silently discard this traffic and that's all there is to it.
On the other hand, a change in the status of the physical interface is all too easily noticed and will result in an STP-state change.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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