H3C Technologies H3C S12500-X Series Switches - Manual (Page 105)

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Configuring load sharing
Overview
If a routing protocol finds multiple equal-cost best routes to the same destination, the device forwards
packets over the equal-cost routes to implement load sharing.
Configuring load sharing
Load sharing is implemented in the following ways:
• It a routing protocol finds multiple equal-cost best routes, the device implements per-flow load
sharing according to the 5-tuple (source IP address, destination IP address, source port number,
destination port number, and IP protocol number).
• In a complex network, a single load sharing algorithm cannot meet the requirements of load
sharing. You can implement load sharing by specifying different algorithms.
To configure per-flow load sharing:
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure per-flow load
sharing.
• In standalone mode:
ip load-sharing mode per-flow
[ algorithm algorithm-number |
[ dest-ip | dest-port | ip-pro |
src-ip | src-port ] * ] [ slot
slot-number ]
• In IRF mode:
ip load-sharing mode per-flow
[ algorithm algorithm-number |
[ dest-ip | dest-port | ip-pro |
src-ip | src-port ] * ] [ chassis
chassis-number slot
slot-number ]
By default, the device performs
per-flow load sharing based on the
source IP address, destination IP
address, source port, destination
port, and IP protocol number.
Load sharing configuration example
Network requirements
As shown in Figure 41 , Switch A has two equal-cost routes to Switch B. Configure load sharing to forward
packets through Switch B to the destination IP address 1.2.3.4/24.