What is the result of entering the command port-channel load-balance src-dst-ip on an
EtherChannel link?
A.
Packets are distributed across the ports in the channel based on the source and
destination MAC addresses.
B.
Packets are distributed across the ports in the channel based on both the source and
destination IP addresses.
C.
Packets are balanced across the ports in the channel based first on the source MAC
address, then on the destination MAC address, then on the IP address.
D.
Packets are distributed across the access ports in the channel based first on the source
IP address and then on the destination IP addresses.
Explanation:
Traffic in an EtherChannel is distributed across the individual bundled links in a deterministic
fashion; however, the load is not necessarily balanced equally across all the links. Instead,
frames are forwarded on a specific link as a result of a hashing algorithm. The algorithm can
use source IP address, destination IP address, or a combination of source and destination IP
addresses, source and destination MAC addresses, or TCP/UDP port numbers. The hash
algorithm computes a binary pattern that selects a link number in the bundle to carry each
frame. The hashing operation can be performed on either MAC or IP addresses and can be
based solely on source or destination addresses, or both. Use the following command to
configure frame distribution for all EtherChannel switch links:
Switch(config)# port-channel load-balance method
The default configuration is to use source XOR destination IP addresses, or the src-dst-ip
method.
Reference:
CCNP BCMSN Official Exam Certification Guide, Fourth Edition, Chapter 7: Aggregating
Switch Links, Distributing Traffic in EtherChannel, p. 165