A network administrator is evaluating the operational behavior and port roles of Rapid PVST+ on Cisco Catalyst switches. Which two statements regarding Rapid PVST+ operations are correct?
- An Alternate port functions as a backup path to the root bridge and can rapidly transition to the root port role if the active root port fails.Answer
- Designated ports utilize an explicit proposal and agreement handshake on point-to-point links to transition directly to the forwarding state.Answer
- CPortFast should be configured on interswitch trunk links to eliminate spanning tree convergence delays between switches.
- DThe switch bridge priority for a VLAN can be set to any arbitrary integer value between 0 and 65535, such as 5000.
Answer
The two correct statements are that an Alternate port acts as a backup path to the root bridge, and that Designated ports use a proposal and agreement handshake on point-to-point links for rapid state transitions.
Rapid PVST+ defines an Alternate port as a discarded port receiving BPDUs from another switch, providing a backup path toward the root bridge. Additionally, Rapid PVST+ uses a proposal/agreement handshake on point-to-point links to bypass legacy 802.1D listening/learning timers and achieve rapid convergence.
Step-by-Step Solution
Key Concept
Rapid PVST+ Port Roles and Sync Handshake Mechanics