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Table 10 lists the maximum number of trunk ports that a switch can
support at one time. The number varies by line card. For example,
a switch can have a maximum of eight trunk ports when a trunk is
build with ports on AT-XEM2-12XS Line Cards.
Table 10. Maximum Number of Trunk Ports Per Switch
Ethernet Line Card
AT-XEM2-12XT
AT-XEM2-12XS
AT-XEM2-4QS
AT-XEM2-1CQ
1. Requires 10Gbps SFP+ transceivers. Stack trunks are not supported with
1Gbps SFP transceivers.
Figure 13 is an example of a trunk that exceeds the permitted
number of ports per switch. The trunk uses AT-XEM2-4QS Line
Cards, which, as listed in Table 10, can have a maximum of four
trunk ports per switch. The two switches have six stacking ports
each, making the trunk invalid. To bring the example into
compliance with the rule, you would have to remove two trunk ports
from each switch.
Figure 13. Invalid Trunk with Too Many Stacking Ports
AT-SBx908 GEN2 Installation Guide for Virtual Chassis Stacking
Maximum Number of Trunk
Ports Per Switch
8
1
8
4
2
Chassis 1
Chassis 2
49
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