Dell Force10 S4810P Configuration Manual page 493

C-Series and S-Series load-balancing
For LAG hashing on C-Series and S-Series, the source IP, destination IP, source TCP/UDP port, and
destination TCP/UDP port are used for hash computation by default. For packets without a Layer 3 header ,
FTOS automatically uses
IP hashing or MAC hashing should not be configured 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 on the C-Series and S-Series, use the following command:
Command Syntax
[ no ] load-balance { ip-selection
[ dest-ip | source-ip ]} | { mac
[ dest-mac | source-dest-mac |
source-mac ]} | { tcp-udp enable } |
{ ing-port }
Hash algorithm
The command discussed above selects the hash criteria applied to port channels.
load-balance
If even distribution is not obtained with the load-balance command, the
used to select the hash scheme for LAG, ECMP and NH-ECMP. The 12 bit Lag Hash can be rotated or
shifted till the desired hash is achieved.
The option allows you to change the hash value for recursive ECMP routes independently of
nh-ecmp
non-recursive ECMP routes. This option provides for better traffic distribution over available equal cost
links that involve a recursive next hop lookup.
load-balance mac source-dest-mac
Command Mode
CONFIGURATION
.
Purpose
Replace the default IP 4-tuple method of balancing
traffic over a port channel. You can select one, two, or
all three of the following basic hash methods
ip-selection [ dest-ip | source-ip ]
based on IP destination or source address.
mac [ dest-mac | source-dest-mac | source-mac ]
Distribute IPV4 traffic based on the destination or source
MAC address, or both, along with the VLAN, Ethertype,
source module ID and source port ID.
—Distribute traffic based on TCP/UDP
tcp-udp enable
source and destination ports.
ing-port —Distribute traffic based on the port ID of the IP
source address.
hash-algorithm
—Distribute IP traffic
—
command can be
Interfaces | 493