Brocade Communications Systems 8/80 Service Manual download pdf (Page 52)

ServerIron Switching and Routing Guide

Flexible Trunk Eligibility

Flexible Trunk Eligibility increases the tolerance for down ports during link negotiation. In a valid trunk

configuration (2-port, 4-port, or 8-port trunk starting on a valid primary port number) 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 do 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 2.5 shows an example of 2-port groups in a range of eight 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 2.5 Two-port groups used to determine aggregation eligibility

Port 1/2

Port 1/4

Port 1/1

Port 1/6

Port 1/3

Port 1/7

Port 1/8

Port 1/5

Group 2

Group 3

Group 4

Group 1

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Brocade Communications Systems 8/80 Service Manual Page 52