*Non-VLAN 1 STP BPDUs are sent to the PVST+ MAC address (also called the Shared Spanning Tree Protocol [SSTP] MAC address, 0100.0ccc.cccd), tagged with a corresponding IEEE 802.1Q VLAN tag.
If the Native VLAN on an IEEE 802.1Q trunk is not VLAN 1:
*VLAN 1 STP BPDUs are sent to the PVST+ MAC address, tagged with a corresponding IEEE 802.1Q VLAN tag.
*VLAN 1 STP BPDUs are also sent to the IEEE STP MAC address on the Native VLAN of the IEEE 802.1Q trunk, untagged.
*Non-VLAN 1 STP BPDUs are sent to the PVST+ MAC address, tagged with a corresponding IEEE 802.1Q VLAN tag.
Note: Native VLAN STP BPDUs are sent untagged.
This way, VLAN 1 STP of PVST+ merges with STP of IEEE 802.1D or 802.1Q, while other VLANs are tunneled through the cloud of IEEE 802.1D or 802.1Q bridges. For example, the IEEE 802.1D or 802.1Q cloud looks similar to a ?wire? to the PVST+ VLANs other than 1.
For STP to operate correctly, observe certain rules when you connect PVST+ bridges to IEEE 802.1D or 802.1Q bridges. The main rule is that PVST+ bridges must connect to IEEE 802.1D or 802.1Q bridges through an IEEE 802.1Q trunk with a consistent Native VLAN on all bridges that connect to the cloud of IEEE 802.1Q or 802.1D bridges.
The PVST+ BPDU contains a VLAN number that allows PVST+ bridges to detect whether the previous rule is not respected. When a Catalyst switch detects a misconfiguration, the corresponding ports are put into a ?PVID-inconsistent? or ?type-inconsistent? state, which effectively blocks the traffic in the corresponding VLAN on a corresponding port. These states prevent forwarding loops that misconfigurations or miswiring cause.
what do you have connected to FastEthernet0/24 ? If this is another switch, try and set the port (on the other side as well) to fixed duplex and speed settings. What type of switch (and IOS version) is this anyway ? Can you post the configuration of the switch ?
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...