How does an MST region send VLAN information through the PVST simulation mechanism to a switch that runs PVST+?
- It sends out one PVST+ BPDU that maps all VLANs into VLAN1.
- It sends out one PVST+ BPDU with the information from the IST.
- It sends out multiple PVST+ BPDUs, one for each VLAN, plus the IST.
- It sends out PVST+ BPDUs, one for each VLAN, using the information from the IST.
| Answers Explanation & Hints:
The PVST simulation mechanism sends out PVST+ including RSTP BPDUs, one for each VLAN, using the information derived from the internal spanning tree (IST). This requires a mapping of one topology in IST to multiple VLANs toward the PVST link. |