352-001 · Question #19
What are two design advantages to using virtual port channel? (Choose two.)
The correct answer is A. enhanced system availability through multiple systems C. loop management without use of Spanning Tree Protocol. Virtual port channel (vPC) improves network design by distributing an EtherChannel across two physical switches for dual-chassis redundancy and by using its own loop-prevention mechanism instead of Spanning Tree Protocol.
Question
What are two design advantages to using virtual port channel? (Choose two.)
Options
- Aenhanced system availability through multiple systems
- Breduced Spanning Tree Protocol convergence time
- Cloop management without use of Spanning Tree Protocol
- Dability to use Spanning Tree Protocol blocked ports to forward traffic
- Eenhanced ability to recover from Spanning Tree Protocol changes
How the community answered
(50 responses)- A90% (45)
- B2% (1)
- D6% (3)
- E2% (1)
Why each option
Virtual port channel (vPC) improves network design by distributing an EtherChannel across two physical switches for dual-chassis redundancy and by using its own loop-prevention mechanism instead of Spanning Tree Protocol.
vPC distributes a single logical EtherChannel across two separate physical Nexus switches, so a failure of one entire chassis does not bring down the port channel, directly enhancing system availability.
vPC eliminates the need for STP on vPC member ports entirely rather than simply reducing STP convergence time.
vPC uses a peer-link and peer-keepalive mechanism to prevent Layer 2 loops, allowing all member links to forward traffic simultaneously without relying on STP to block redundant paths.
vPC does not reclaim STP-blocked ports - it removes the condition that would cause those ports to be blocked in the first place by making all links active simultaneously.
vPC removes the dependency on STP for loop prevention rather than improving the speed or quality of STP change recovery.
Concept tested: Virtual port channel design benefits and loop prevention
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/interfaces/config/cisco_nexus7000_interfaces_config_guide/config_vpc.html
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