
Q: What is EtherChannel?
Ans: EtherChannel is an aggregation or bundling of multiple physical links into a single virtual link.
Q: Benefits of EtherChannel?
Ans:
It provides more bandwidth by combining multiple physical links into a single virtual link.
It offers redundancy.
Q: What are the parameters to be the same to configure EtherChannel?
Ans:
Same duplex
Same speed
Same VLAN
Trunk or access mode must be the same.
Q: How many interfaces can aggregate or bundle using EtherChannel?
Ans: We can aggregate up to 16 interfaces. 8 will be active, and 8 will be standby.
Q: Is EtherChannel Layer 2 or Layer 3?
Ans: EtherChannel is both Layer 2 and Layer 3.
Q: How many types to configure EtherChannel?
Ans:
Manual (Static EtherChannel)
PAgP (Port Aggregation Control Protocol)
LACP (Link Aggregation Control Protocol)
Q: Difference between PAgP and LACP?
Ans:
PAgP (Port Aggregation Control Protocol): Cisco proprietary.
LACP (Link Aggregation Control Protocol): Open standard.
Q: Can we configure EtherChannel between different devices?
Ans: Yes. EtherChannel can be configured between:
Switch to Server
Switch to Router
Q: Modes used in PAgP and LACP to form EtherChannel?
Ans:
LACP: Active, Passive
PAgP: Auto, Desirable
Q: Configuration of EtherChannel?
Ans:
bash
Copy
# int range fa0/1-2 # channel-group 1 mode <on/auto/desirable/active/passive>
Q: How does EtherChannel load balance the traffic?
Ans: EtherChannel uses a load balancing algorithm to send traffic based on one of the following criteria:
Source IP
Destination IP
Source-Destination IP
Source MAC
Destination MAC
Source Port
Destination Port
