Cisco Systems Cisco 1711, Cisco 1712 manual - page 7

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Cisco 1711 and Cisco 1712 Security Access Routers Hardware Installation Guide
OL-4050-02
Chapter 2 Installation
Connecting Power to the Router
Step 2 Connect the other end of the cable to a port on the hub, switch, or the Ethernet
port on your computer.
Note The example provided in Figure 2-3 on page 2-6 shows connectivity to
a hub. The router’s Ethernet switch port can be connected to other
networked devices, such as a switch or computer with a NIC. If you are
connecting the router’s switch port to another switch, use a crossover
cable.
Note If you are connecting a computer to the router’s switch port, it will take about
30 seconds for connectivity to be established due to the Spanning-Tree Protocol
(STP) disabling the ports until a loop-free topology is determined. When you use
this type of connection, you must configure the spanning-tree portfast command
on the router’s switch port. The spanning-tree portfast command causes a
spanning tree port to enter the forwarding state immediately, bypassing the
listening and learning states.
Caution You can use the portfast feature on switch ports that are connected to a single
workstation or PC only to allow those devices to connect to the network
immediately, rather than waiting for spanning tree to converge. Do not use the
portfast feature on ports that are connected to networking devices such as hubs,
routers, switches, bridges, or concentrators.
Connecting Power to the Router
Read the following warnings before connecting the router to power.
Warning The power supply is designed to work with TN power systems.