Dell Force10 Z9000 - Page 396

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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
load-balance mac source-dest-mac.
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:
Hash algorithm
The load-balance command discussed above selects the hash criteria applied to port channels.
If even distribution is not obtained with the load-balance command, the
hash-algorithm command can be
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
nh-ecmp option allows you to change the hash value for recursive ECMP routes independently of
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 ip-selection packet-based
Packet based: IPV4
No distribution: IPV6
Packet-based MAC-based
load-balance ip-selection packet-based
load-balance ip-selection mac
MAC-based Packet-based MAC-based
Command Syntax Command Mode Purpose
[no] load-balance {ip-selection
[dest-ip | source-ip]} | {mac
[dest-mac | source-dest-mac |
source-mac]} | {tcp-udp enable}
CONFIGURATION 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]—Distribute IP traffic
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.
tcp-udp enable—Distribute traffic based on TCP/UDP
source and destination ports.
Table 19-5. The load-balance Commands and Port Channel Types
Configuration Commands
Switched
IP Traffic
Routed
IP Traffic
(IPv4 only)
Switched
Non-IP Traffic