Foundry Configuration Guide for the FESX, FSX, and FWSX
10 - 16 © Foundry Networks, Inc. December 2005
Flexible Trunk Eligibility
The criteria for being eligible to be in an aggregate link are flexible. A range of ports can contain down ports and
still be eligible to become an aggregate link.
The device groups the device's ports into 2-port groups consisting of an odd-numbered port and the next even-
numbered port. For example, ports 1/1 and 1/2 are a two-port group, as are ports 1/3 and 1/4, 9/1 and 9/10, and
so on. If either of the ports in a two-port group is up, the device considers both ports to be eligible to be in an
aggregate link.
Figure 10.6 shows an example of 2-port groups in a range of four ports on which link aggregation is enabled.
Based on the states of the ports, some or all of them will be eligible to be used in an aggregate link.
Figure 10.6 Two-port groups used to determine aggregation eligibility
Table 10.6 shows examples of the ports from Figure 10.6 that will be eligible for an aggregate link based on
individual port states.
As shown in these examples, all or a subset of the ports within a port range will be eligible for formation into an
aggregate link based on port states. Notice that the sets of ports that are eligible for the aggregate link must be
valid static trunk configurations.
Table 10.6: Port Eligibility for Link Aggregation
Port Group 1 Port Group 2 Trunk
Eligibility
1/1 1/2 1/3 1/4
Link
State
Up Up Up Up 4-port
1/1 – 1/4
Up Up Up Down 4-port
1/1 – 1/4
Up Down Up Down 4-port
1/1 – 1/4
Up Up Down Up 4-port
1/1 – 1/4
Down Down Down Up 2-port
1/3 – 1/4
Up Down Down Down 2-port
1/1 – 1/2
Port 1/2
Port 1/4
Port 1/1
Port 1/3
Group 2
Group 1
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