Link Aggregation Configuration Example
Fixed Switch Configuration Guide 11-13
Which device determines port selection for the LAG is an optional consideration. If system
priorities remain at the default value, the lowest MAC address device determines port selection
for the LAG. For purposes of this example, we will set the system priority of the fixed switch Stack
1 to 100 to ensure it will control port selection for LAG1, instead of the S8. The fixed switch Stack 2
system priority will be set to 100 to ensure it will control port selection for LAG2, instead of the S8.
For the stackable switch to control port selection for LAG3 requires that you ensure that the server
has a system priority higher than 100.
Each LAG in our example is made up of physical ports of the same speed, so there is no need to set
the port priority to a non-default value. The only port value to be changed is the admin key for
each physical port and each LAG. These modifications are detailed in Table 11-6 on page 11-13.
Given that the intent of the example is to have three LAGs of 4 ports each, there is no need to
enable the single port LAG feature. Once the LAGs initiate, they will persist across resets. Should
only a single port be active after a reset, the LAG will form regardless of the single port LAG
feature setting.
Table 11-6 LAG and Physical Port Admin Key Assignments
Device LAG LAG Admin Key Physical Port
Physical Port
Admin Key
S8 Distribution Switch 1 100 ge.1.1 100
ge.2.1 100
ge.3.1 100
ge.4.1 100
2 200 ge.1.2 200
ge.2.2 200
ge.3.2 200
ge.4.2 200
Fixed Switch Stack 1 1 100 ge.1.21 100
ge.1.22 100
ge.2.23 100
ge.3.24 100
Fixed Switch Stack 2 2 200 ge.1.21 200
ge.1.22 200
ge.1.23 200
ge.1.24 200
3 300 ge.2.17 300
ge.2.19 300
ge.2.22 300
ge.2.24 300
Server 3 300 NIC1 ETH 300
NIC2 ETH 300
NIC3 ETH 300
NIC4 ETH 300
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