Brocade Communications Systems ICX 7250 series, Руководство по настройке

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How IP load sharing works
When ECMP is enabled, multiple equal-cost paths for the destination IP is installed in the hardware Layer 3 routing table. When an
ingress Layer 3 IP traffic matches with the entry in the hardware for Layer 3 routing, one of the paths is selected based on the internal
Hardware hashing logic and the packet gets forwarded on that path.
Disabling IP load sharing
To disable IP load sharing, enter the following commands.
device(config)# no ip load-sharing
Syntax: no ip load-sharing
Changing the maximum number of ECMP (load sharing) paths
You can change the maximum number of paths the Layer 3 switch supports to a value from 2 through 8. On the Brocade ICX 7750, the
value range for the maximum number of load-sharing paths is from 2 through 32.
TABLE 9 Maximum number of ECMP load sharing paths per device
ICX 7250 / ICX 7450 ICX 7750
8 32
For optimal results, set the maximum number of paths to a value at least as high as the maximum number of equal-cost paths your
network typically contains. For example, if the Layer 3 switch you are configuring for IP load sharing has six next-hop routers, set the
maximum paths value to six.
To change the number of IP load sharing paths, enter a command such as the following.
device(config)# ip load-sharing 6
Syntax: [no] ip load-sharing [ num ]
The num variable specifies the number of paths and can be from 2 through 8, depending on the device you are configuring. On the
Brocade ICX 7750, the value of the num variable can be from 2 through 32.
The configuration of the maximum number of IP load sharing paths to a value more than 8 is determined by the maximum number of
ECMP paths defined at the system level using the
system-max max-ecmp command. You cannot configure the maximum number of IP
load sharing paths higher than the value defined at the system level. Also, you cannot configure the maximum number of ECMP paths at
the system level to a value less than the configured IP load sharing value.
To define the maximum number of ECMP paths at the system level, enter a command such as the following.
device(config)# system-max max-ecmp 20
device(config)# write memory
device(config)# exit
device# reload
Syntax: [no] system-max max-ecmp [ num ]
The num variable specifies the maximum number of ECMP paths and the value range can be from 8 through 32. This command is
supported only on the Brocade ICX 7750.
You must save the configuration and reload the device for the maximum ECMP value change to take effect.
Configuring IP parameters - Layer 3 switches
Brocade FastIron Layer 3 Routing Configuration Guide
74 53-1003903-04