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Table 15 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 XEM2-12XS Line Cards.
Table 15. Maximum Number of Trunk Ports Per Switch
Ethernet Line Card
XEM2-8XSTm
XEM2-12XT
XEM2-12XTm
XEM2-12XS
XEM2-4QS
XEM2-1CQ
The guidelines are listed here:
1. Trunks of twisted pair ports on XEM2-8XSTm, XEM2-12XT, or
XEM2-12XTm Line Cards have to operate at 10Gbps. They cannot
be used as trunk ports at lower speeds.
2. Trunks of SFP+ ports on XEM2-8XSTm, or XEM2-12XS Line Cards
have to use 10Gbps SFP+ transceivers. They cannot be used as
trunk ports at lower speeds.
Figure 19 on page 58 is an example of a trunk that exceeds the
permitted number of ports per switch. The trunk uses XEM2-4QS
Line Cards, which, as listed in Table 15, can have a maximum of
four trunk ports per switch. The two switches have six stacking
ports each, making for an unsupported trunk. To bring the example
into compliance with the rule, you would have to remove two trunk
ports from each switch.
SBx908 GEN2 Installation Guide for Virtual Chassis Stacking
Maximum Number of
Trunk Ports Per Switch
4
8
8
8
4
2
Guidelines
1, 2
1
1
2
57
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