Reference Guide

– secondary: the IP address is the interface’s backup IP address. You can configure up to eight
secondary IP addresses.
Deleting or Disabling a Port Channel
To delete or disable a port channel, use the following commands.
• Delete a port channel.
CONFIGURATION mode
no interface portchannel channel-number
• Disable a port channel.
shutdown
When you disable a port channel, all interfaces within the port channel are operationally down also.
Load Balancing Through Port Channels
Dell Networking OS uses hash algorithms for distributing traffic evenly over channel members in a port
channel (LAG).
The hash algorithm distributes traffic among Equal Cost Multi-path (ECMP) paths and LAG members. The
distribution is based on a flow, except for packet-based hashing. A flow is identified by the hash and is
assigned to one link. In packet-based hashing, a single flow can be distributed on the LAG and uses one
link.
Packet based hashing is used to load balance traffic across a port-channel based on the IP Identifier field
within the packet. Load balancing uses source and destination packet information to get the greatest
advantage of resources by distributing traffic over multiple paths when transferring data to a destination.
Dell Networking OS allows you to modify the hashing algorithms used for flows and for fragments. The
load-balance and hash-algorithm commands are available for modifying the distribution algorithms.
NOTE: Hash-based load-balancing on multi-protocol label switching (MPLS) does not work when
you enable packet-based hashing (load-balance ip-selection packet-based).
Load-Balancing on the S- Series
For LAG hashing on the S6000 the source IP, destination IP, source transmission control protocol (TCP)/
user datagram protocol (UDP) port, and destination TCP/UDP port are used for hash computation by
default. For packets without a Layer 3 header, Dell Networking OS automatically uses
load-balance
mac source-dest-mac
.
Do not configure IP hashing or MAC hashing at the same time. If you configure an IP and MAC hashing
scheme at the same time, the MAC hashing scheme takes precedence over the IP hashing scheme.
To change the IP traffic load-balancing default, use the following command.
• Replace the default IP 4-tuple method of balancing traffic over a port channel.
CONFIGURATION mode
[no] load-balance {ip-selection [dest-ip | source-ip]} | {mac [dest-mac |
source-dest-mac | source-mac]} | {tcp-udp enable} {ipv6-selection} {tunnel}|
{ingress-port}
You can select one, two, or all three of the following basic hash methods:
Interfaces
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