Cisco 2970 - Catalyst Switch Manual de usuario descargar pdf (Pagina 11)

Cisco Catalyst 3750 and 2970 Switches: Using Switches with a PS Series Group

Cisco Switch Interfaces

For Cisco Catalyst 3750 and 2970 switches, an interface name is composed of three parts that are

formatted as follows:

slot_number/interface_module_number/port_number

The variables are as follows:

•

slot_number - The switch slot in which the interface module is installed. Module slots are

numbered 0 to 12, from top to bottom. In the case of the Cisco 3750 switch, the first switch in

a stack is slot number 1; then, the slot numbers increase by one for each switch added to the

stack. In the case of the Cisco 2970 switch, the slot number is always 1. If not specified in a

command, the default value will be the slot or switch to which you are currently connected.

•

interface_module_number - The number of the interface module for this port. When the

module consists of a single card or, in the case of the Cisco 3750 and 2970, this number is

always 0.

•

port_number - The port number on the interface module or, in the case of the Cisco 3750 and

2970, the port number on the switch. Also, keep in mind that, for some commands, you can

assign several ports at once by using wildcards, such as

1/0/1-12 for the first twelve ports on

module 0, switch 1.

Enabling the PortFast Option to Configure STP Edge Ports

To configure STP edge ports on Cisco Catalyst 3750 and 2970 switches, you must enable the

PortFast option. PortFast minimizes the time that ports must wait for Spanning-Tree to converge

and should only be used on ports connected to end nodes (end stations), including iSCSI initiators

and storage array network interfaces.

Caution: Connecting hubs, concentrators, switches, or bridges to a port that has PortFast enabled

can cause temporary spanning-tree loops. You should not enable PortFast on these

ports.

The following example shows how to enable PortFast on Gigabit Ethernet interface 0/1 on

switch 1:

Switch> enable

Switch# config t

Switch(config)# int gigabit 1/0/1

Switch(config-if)# spanning-tree portfast

Switch(config-if)# exit

Switch(config)# exit

Switch# copy running-config startup-config

To view or confirm Port Fast status on a port, use the following command.

Switch# show spanning-tree interface gigabitethernet0/1

1 2 ... 6 7 8 9 10 11 12 13 14 15

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Cisco 2970 - Catalyst Switch Manual de usuario Pagina 11