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CASSATT ACTIVE RESPONSE CONTROL NODE AND NETWORK SWITCH CABLING EXAMPLE 28

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

%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.

%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

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:

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:

1 2 ... 8 9 10 11 12 13 14 15 16 17 18

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