H3C Technologies H3C S12500-X Series Switches - Manual (Page 60)

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Enabling local-first load sharing for link aggregation
Use the local-first load sharing mechanism in a multi-device link aggregation scenario to distribute traffic
preferentially across member ports on the ingress card or device rather than all member ports.
When you aggregate ports on different member devices in an IRF fabric, you can use local-first load
sharing to reduce traffic on IRF links, as shown in
Figure 10 . For more information about IRF, see IRF
Configuration Guide.
Figure 10 Load sharing for multi-switch link aggregation in an IRF fabric
To enable local-first load sharing for link aggregation:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable local-first load sharing
for link aggregation. link-aggregation load-sharing
mode local-first By default, local-first load sharing
for link aggregation is enabled.
NOTE:
Local-first load sharing for link aggregation takes effect on only known unicast packets.
Enabling link-aggregation traffic redirection
Link-aggregation traffic redirection prevents traffic interruption.
With this feature, when you restart a card that contains Selected ports, traffic can be redirected to other
cards. (In standalone mode.)
With this feature, when you restart an IRF member device or its card that contains Selected ports, traffic
can be redirected to other IRF member devices or other cards. (In IRF mode.)
Any Selected ports on the
ingress switch?
Local-first load sharing
mechanism enabled?
Yes No
Yes
No
The egress port for a traffic flow is an
aggregate interface that has Selected
ports on different IRF member switches
Packets are load shared only
across the Selected ports on the
ingress switch
Packets are load shared across
all Selected ports