Datasheet

Release Notes for Catalyst 4500 Series Software Release 7.x

OL-1983-28

Usage Guidelines, Restrictions, and Troubleshooting

This section provide usage guidelines, restrictions, and troubleshooting information for Catalyst 4500

series switch hardware and software.

• System and Supervisor Engine, page 51

• Modules and Switch Ports, page 52

• Spanning Tree, page 55

• VTP, VLANs, and VLAN Trunks, page 56

• EtherChannel, page 57

• SPAN, page 57

• Multicast, page 58

• MIBs, page 58

• Authentication, Authorization, and Accounting, page 58

• Nonembedded CiscoView, page 59

System and Supervisor Engine

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

supervisor engine and to the switch at the system level:

• When connecting NIC: SMC 8432BT with a DEC 21041-AA chipset on a PC Compaq Desktop

6xxxx to a 2980A-G switch at 10/HD, you might experience Align/FCS/Rcv-errors.

• The Catalyst 4006 switch requires dual power supplies. Refer to the Catalyst 4003 and 4006 Switch

Installation Guide for information about power requirements for the Catalyst 4500 series switches.

• In supervisor engine software release 5.2 and later, the show config, write terminal, and copy

config commands return only the nondefault configuration (that is, only commands that change the

default configuration are displayed). Use the all keyword to display both the default and nondefault

configurations (for example, show config all).

• If you need to download configuration files to many switches in a network topology with redundant

EtherChannel links, download the configuration at each switch manually using the configure

network command. Otherwise, in some situations, a broadcast storm can occur.

• Under certain conditions, etherHistoryUtilization is not reported correctly if the counter value wraps

between the two consecutive samples.

Workaround: Reduce the sample interval.

• If your configuration produces thousands of CAM entries, ensure that your screen length is set to a

value greater than 0 before entering the show cam dynamic command.

• The LrnDiscard counter (displayed by entering the show mac command) indicates the number of

times a CAM entry is replaced with a newly learned address when the CAM table is full. The counter

value is not maintained for each port; instead, the value is maintained for the entire switch.

• Although the show spantree command displays PortFast as enabled on a trunk port, spanning tree

PortFast has no effect on trunk ports. Do not use the set portfast command on a trunk port. In

addition, designating a port as a trunk port causes PortFast to be ignored for the port.

• The CLI command show cam dynamic and the SNMP query getmany community@vlan

dot1dTpFdbAddress are sometimes not synchronized.