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 allEtherChannel 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