Virtual Port Channels: Identical Parameters Configuration

Virtual Port Channels Configuration


Which two parameters must be identical per interface while configuring virtual port channels.

(Choose two.)



Click on the arrows to vote for the correct answer

A. B. C. D. E.


When configuring Virtual Port Channels (vPC), there are two parameters that must be identical per interface. These two parameters are:

  1. Bridge Assurance Setting: Bridge Assurance is a feature used by the Spanning Tree Protocol (STP) to ensure that a port is connected to a network segment that can receive BPDUs. It works by sending special BPDUs, called Bridge Assurance BPDUs, between connected devices. If a device fails to receive a Bridge Assurance BPDU within a certain timeframe, it will put the port into an STP blocking state. Therefore, the Bridge Assurance Setting should be identical on both interfaces of a vPC to ensure that both sides of the vPC can receive and process Bridge Assurance BPDUs.

  2. Maximum Transmission Unit (MTU): The Maximum Transmission Unit (MTU) is the largest size packet that can be sent over a network interface without fragmentation. If one side of the vPC has a larger MTU than the other side, then there is a risk that packets may be dropped or fragmented, which can cause performance issues. Therefore, the MTU should be identical on both interfaces of a vPC to ensure that packets can be sent between the two interfaces without any issues.

The other options listed in the question are not related to vPC and are not required to be identical per interface.

A. Network Access Control (NAC) is a method of enforcing security policies on network devices. It is not related to vPC.

C. IP Source Guard is a feature used to prevent IP spoofing attacks. It is not related to vPC.

E. Protocol Independent Multicast (PIM) is a multicast routing protocol. It is not related to vPC.