No limitation be aware of the following:
The WS-X4418-GB Gigabit Ethernet switching module offers two dedicated 1000BASE-X (GBIC) ports (ports 1 and 2) and 16 oversubscribed (possibly blocking) 1000BASE-X (GBIC) Gigabit Ethernet ports. The module provides a Gigabit Ethernet network backbone connection for multiple servers and high-end workstations.
Ports 1 and 2 each have 1-Gbps dedicated bandwidth. These ports are typically used to connect to the network backbone.
The 16 oversubscribed ports (ports 3 through 18) are multiplexed in four groups of four ports each:
*Ports 3, 5, 7, 9
*Ports 4, 6, 8, 10
*Ports 11, 13, 15, 17
*Ports 12, 14, 16, 18
Lines on the front panel of the WS-X4418-GB are used to frame the port groups.
Each group of four ports shares 1-Gbps of bandwidth.
The oversubscribed Gigabit ports are typically used to connect to clients or servers equipped with Gigabit Ethernet network interface cards (NICs).
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/hw_doc/mod_inst/03instal.htm#wp1037570
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/hw_doc/install/01intro.htm#wp1015201
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