Datasheet
53
Release Notes for Catalyst 4500 Series Software Release 7.x
OL-1983-28
Usage Guidelines, Restrictions, and Troubleshooting
• If you have a port whose speed is set to auto and is connected to another port whose speed is set to
a fixed value, configure the port whose speed is set to a fixed value for half duplex, or you can
configure both ports to a fixed-value port speed and full duplex.
• When you connect end stations (such as Windows 95, 98, or NT workstations) to Catalyst 4500
series 10/100-Mbps switch ports, we recommend this configuration:
–
Spanning tree PortFast enabled
–
Trunking off
–
Channeling off
In supervisor engine software release 5.2 and later, you can use the set port host command to
optimize the port configuration for host connections. This command automatically enables PortFast
and sets the trunking and channeling modes to off.
In software releases prior to release 5.2, you can optimize the port configuration for host
connections as follows:
–
Use the set spantree portfast mod_num/port_num enable command to enable PortFast on a
port.
–
Use the set trunk mod_num/port_num off command to disable trunking on a port.
–
Use the set port channel port_list off command to disable channeling on a port.
Note You must specify a valid port range when entering the set port channel command. You cannot
specify a single port.
This example shows how to configure a port for end station connectivity using the set port host
command:
Console> (enable) set port host 2/1
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.
Port(s) 2/1 trunk mode set to off.
Port(s) 2/1 channel mode set to off.
Console> (enable)
This example shows how to manually configure a port for end station connectivity:
Console> (enable) set spantree portfast 2/2 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 2/2 fast start enabled.
Console> (enable) set trunk 2/2 off
Port(s) 2/2 trunk mode set to off.
Console> (enable) set port channel 2/1-2 off
Port(s) 2/1-2 channel mode set to off.
Console> (enable)
• On Catalyst 4500 series modules that contain 10/100-Fast Ethernet ports, the Carri-Sen counter (in
the output of the show port command) might erroneously show a value of 1, indicating an error
occurred even though, in most cases, a carrier sense error did not occur.