3Com S7902E, Configuration Manual

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Link Aggregation Configuration Examples
In an aggregation group, the port to be a selected port must be the same as the reference port in port
attributes, and class-two configurations. To keep these configurations consistent, you should configure
the port manually.
z
Reference port: Select a port as the reference port from the ports that are in up state and with the
same class-two configurations as the corresponding aggregate interface. The selection order is as
follows: full duplex/high speed, full duplex/low speed, half duplex/high speed, and half duplex/low
speed, with full duplex/high speed being the most preferred. If two ports with the same duplex
mode/speed pair are present, the one with the lower port number wins out.
z
Port attribute configuration includes the configuration of the port rate, duplex mode, and link state.
z
For details about class-two configurations, see section Class-two configurations.
When you configure cross-card link aggregation, if link aggregation across different types of cards,
however, you may need to enable MAC address table synchronization manually, see section Enabling
MAC Address Table Synchronization for Cross-Card Aggregation.
Layer 2 Static Aggregation Configuration Example
Network requirements
As shown in Figure 1-2, Device A and Device B are connected through their respective Layer 2 Ethernet
ports GigabitEthernet 2/0/1 to GigabitEthernet 2/0/3.
Aggregate the ports on each device to form a static link aggregation group, thus balancing traffic across
the member ports. In addition, perform load sharing based on source and destination MAC addresses.
Figure 1-2 Network diagram for Layer 2 static aggregation
GE2/0/1 GE2/0/2 GE2/0/3
GE2/0/1
G
E
2/0/2
GE2/0/3
Configuration procedure
1) Configure Device A
# Configure the device to perform load sharing based on source and destination MAC addresses for link
aggregation groups.
<DeviceA> system-view
[DeviceA] link-aggregation load-sharing mode source-mac destination-mac