Cisco Systems Network Switch Cabling manual Setting the portfast option means

Page 13

13. Set the remaining interfaces, which are identical, as follows.

If the switches connect to a gateway device through another switch or a device that participates in spanning tree protocol, do not set spanning tree portfast for the link to that device.

At this prompt...

Enter...

Notes

 

 

 

sw01(config)#

interface range GigabitEthernet 1/0/3 – 24

Setting the portfast option means

 

 

that the port starts forwarding

 

 

packets immediately instead of

 

 

waiting for spanning tree protocol

 

 

packets. This allows for less

 

 

dropped packets when a switch

 

 

first is brought online. This

 

 

explanation assumes that none of

 

 

the interfaces are running

 

 

spanning tree. All spanning tree-

 

 

to-spanning tree switches must not

 

 

have spanning-tree portfast

 

 

enabled. If they do have it enabled,

 

 

the interface is automatically

 

 

disabled upon receipt of a

 

 

spanning tree packet.

 

 

 

sw01(config-if-range)#

spanning-tree portfast

Displays the following output:

 

%Warning: portfast should only be enabled on ports connected to

 

a single host. Connecting hubs, concentrators, switches,

 

bridges, etc... to this interface when portfast is enabled, can

 

cause temporary bridging loops.

 

 

Use with CAUTION

 

 

%Portfast will be configured in 22 interfaces due to the range

 

command but will only have effect when the interfaces are in a

 

non-trunking mode.

 

At this prompt...

Enter...

Notes

 

 

 

sw01(config-if-range)#

switchport mode access

 

sw01(config-if-range)#

exit

 

sw01(config)#

interface range GigabitEthernet 2/0/2 – 24

 

sw01(config-if-range)#

spanning-tree portfast

Displays the following output:

%Warning: portfast should only be enabled on ports connected to a single host. Connecting hubs, concentrators, switches, bridges, etc... to this interface when portfast is enabled, can cause temporary bridging loops.

Use with CAUTION

CASSATT ACTIVE RESPONSE CONTROL NODE AND NETWORK SWITCH CABLING EXAMPLE

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Contents Port numbering Control Node and Network Switch Cabling ExampleSwitch Panel and Control Node Cabling Shows how each port is used on the switch and control node Up application nodes Racking and cabling guidelinesThen Connecting the switch to a terminal server Configuring the switchesDelete the Vlan database, as follows Restoring the factory default settingsRenumber the switch, as follows Enter the configuration mode, as followsExit the configuration mode, as follows Setting switch optionsHalt and perform a cold restart, as follows Turn off all interfaces on the first switch, as follows Enter the configuration mode, as followsEnter the privileged mode, as follows Turn the messages off, as followsSet the switch stack’s enable password, as follows Set the host name of the switch stack, as followsTurn off the Vlan trunking protocol VTP, as follows Should be sent over it Set the interface connection to the router, as followsSetting the portfast option means Turn off the Http server, as follows Disable Igmp snooping, as followsSet the message of the day, as follows Message as required byVerify the switch configuration, as follows Exit the configuration mode, as followsTurn all the interfaces back on, as follows Turn logging to the console back on, as followsPage XXX Displays the following output
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