Cisco RJ-45-to-AUX - Enabling Portfast on a Set;Clear Command−Based Switch; Disabling Portfast on a Set;Clear Command−Based Switch; Enabling Portfast on a Cli−Based IOS Switch

catalyst5000> (enable) show interface
sl0: flags=51<UP,POINTOPOINT,RUNNING>
slip 0.0.0.0 dest 0.0.0.0
sc0: flags=63<UP,BROADCAST,RUNNING>
vlan 1 inet 208.44.88.4 netmask 255.255.255.192 broadcast 208.44.88.63
catalyst5000> (enable)
Enabling PortFast on a Set/Clear Command−Based Switch
To enable PortFast on a Set/Clear command−based switch port, use the following Privileged mode command:
set spantree portfast <module/port> enable
In this example, 2 is the module number and 1 is the port number:
catalyst5000> (enable) set spantree portfast ?
<trcrf> Token Ring TRCRF vlan number
<mod/port> Module number and Port number(s)
bpdu−guard Portfast BPDU guard
catalyst5000> (enable) set spantree portfast 2/1 ?
disable Disable port fast start
enable Enable port fast start
catalyst5000> (enable) set spantree portfast 2/1 enable
Warning: Spantree port fast start should only be enabled on ports connected
to a single host. Connecting hubs, concentrators, switches, bridges, etc.
to a fast start port can cause temporary spanning tree loops. Use with
caution.
Spantree port 2/1 fast start enabled.
Disabling PortFast on a Set/Clear Command−Based Switch
To disable PortFast on a Set/Clear command−based switch port, use the following Privileged mode command:
set spantree portfast <module/port> disable
In this example, 3 is the module number and 8 is the port number:
set spantree portfast 3/8 disable
Enabling PortFast on a CLI−Based IOS Switch
To enable PortFast on a Cisco IOS command−based switch, use this Interface Configuration mode command:
spantree start−forwarding
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