10Gbps stack trunks on AT-x550-18XSPQm Switches cannot use
ports from both sets of 10Gbps stacking ports, listed in Table 18 on
page 61. Figure 26 is an example of this type of invalid trunk.
Figure 26. Invalid 10Gbps Stack Trunk with Ports from Both Stacking Pairs
on AT-x550-18XSPQm Switches
x550 Series Installation Guide for Virtual Chassis Stacking
69