Datasheet

Release Notes for Catalyst 4500 Series Software Release 7.x

OL-1983-28

Usage Guidelines, Restrictions, and Troubleshooting

• The Port Name field in the output of the show port command displays only the first 18 characters

of the port name. If you specify a port name that contains more than 18 characters the last characters

will not be displayed in the output. (CSCed09784)

• If you attach a long cable (20 feet or longer) that is disconnected at the far end to the console port

of a Catalyst 4500 series or Catalyst 2948G switch, then the resulting crosstalk on the serial line may

prevent the switch from booting until you disconnect the cable from the switch or plug the cable into

an active serial port (such as a serial port on a PC or a terminal server) at the remote end.

(CSCdw69459 and CSCdr73326)

• The Catalyst 2948G switch may unexpectedly reset if a large number of ICMP redirect entries are

learned by the switch. ICMP entries are stored in mbuf memory. When too many ICMP entries are

learned, they use up crucial resources and cause the switch to reset.

Workaround: Disable ICMP redirect learning by entering the set icmp redirect disable command.

Configure static routes for the required destinations using the set ip route command. This problem

is resolved in software release 7.6(5). (CSCed00225)

Caution If you upgrade from software release 7.6.4 to any higher 7.6.x release, with the auto-configure feature

enabled, the feature remains enabled. Cisco Systems does not support the auto-configure feature on the

Catalyst 4500 series platform. You can disable the auto-configure feature by entering the hidden set port

security auto-configure disable command.

Modules and Switch Ports

This section contains usage guidelines, restrictions, and troubleshooting information that apply to

modules and switch ports:

• Power over Ethernet modules do not support the Ethernet debounce timer. (CSCin52662)

• If a module fails to come online, reset the module by entering the reset mod_num command.

• This message indicates a potential port configuration error:

2000 Feb 15 16:15:28 %SYS-4-P2_WARN: 1/Blocked queue on gigaport 5 ( 15 : 1 )

If you receive this message, enter the command show port counters and check each port for

excessive error frames, such as collisions, runts, and transmit errors.

• When hot inserting a module into a Catalyst 4500 series chassis, use the ejector levers on the front

of the module to seat the backplane pins properly. Incorrectly inserting a module can cause

unexpected behavior. For proper module installation instructions, refer to the Catalyst 4003 and

4006 Switch Installation Guide.

• When you replace a module (other than the supervisor engine) with a module of a different type, or

when you insert a module (other than the supervisor engine) in an empty slot, entering the command

clear config mod_num clears the module configuration information in the supervisor engine and

obtains the correct spanning tree parameters.

• If a port fails the physical-medium-dependent (PMD) loopback test after the Catalyst 4500 series

switch is reset (that is, if a port LED is flashing orange after a reset), you must reset the affected

module.

• If the Catalyst 4500 series switch detects a port-duplex misconfiguration, the misconfigured switch

port is disabled and placed in the errdisable state. Reconfigure the port-duplex setting and use the

set port enable command to reenable the port.