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Replied by: ftallet - Technical Leader, CISCO SYSTEMS, CCIE - Aug 25, 2009, 6:28am PST
The interaction STP/RSTP is specified in the standard, it is not specific to Cisco (even if here, PVST modes are cisco proprietary). Basically, STP bridges drop RSTP BPDUs. As a result, they send BPDUs to their RSTP neighbors. An RSTP bridge that receives an STP BPDU know that it's connected to a legacy device and start sending STP BPDUs itself.
This mechanism will happen on a per-vlan basis with Cisco PVST/Rapid-PVST.
Regards,
Francois |
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