Installation guide

78
Release Notes for Catalyst5000 Family Software Release4.x
OL-2306-01
Usage Guidelines, Restrictions, and Troubleshooting
Whenever you connect a Catalyst 5000 family port that is set to autonegotiate to an end station or
another networking device, make sure that the other device is configured for autonegotiation as well.
If the other device is not set to autonegotiate, the Catalyst 5000 family port will remain in
half-duplex mode, which can cause a duplex mismatch resulting in packet loss, late collisions, and
line errors on the link.
With a system containing a Supervisor Engine III or IIIF with an NFFC or NFFCII, do not hot
insert a Token Ring module (WS-X5030 and WS-X5031) because it can cause the switch to reset.
Instead, power down the switch before inserting the Token Ring module.
The show mac command displays the InDiscard counter value as zero, instead of the actual counter
value for Ethernet ports. (The InDiscard counter tracks the number of frames that the Catalyst5000
family switch discards because the frames were destined for the local segment.)
Under heavy traffic conditions, and with a duplex mismatch between connected ports, the following
Catalyst 5000 family modules might transmit frames with bad CRC values:
48-port 10BASE-T Telco Ethernet module (WS-X5012)
48-port 10BASE-T Telco Ethernet module (WS-X5012A)
Two-slot 48-port 10BASE-T RJ-45 Ethernet module (WS-X5014)
If you are using FDDI modules in your Catalyst5000 family switch, we recommend that you run
FDDI software release 2.1(7) or later.
Do not install a Network Analysis Module (WS-X5380) in a Catalyst5000 series chassis with a
Supervisor Engine I. Do not install a Network Analysis Module in a Catalyst5000 family chassis
with a Supervisor Engine II in software releases prior to release4.5(1).
Serial download is supported for downloading Flash code to the supervisor engine, but not to the
switching modules.
In some instances, when using the autonegotiating functions of either the WS-X5213 or
WS-X5213A 10/100-Mbps Fast Ethernet 12-port switching modules to connect to another
autonegotiating Ethernet or Fast Ethernet device over a cable distance of 98 to 131 feet (30 to
40meters), the duplex mode and port speed might be incorrectly negotiated. In this case, the link
between the devices cannot be established. To recover from this situation, manually set the port
speed and duplex mode manually.
Alignment and frame check sequence (FCS) errors are detected when 3Com 3c595 and 3c905 cards
are attached to a Catalyst5000 family switch. (CSCdj01465)
You cannot disable an ATM module by entering the set module disable command.
Workaround: Session to the ATM module and shut down the ATM interface using the shutdown
interface configuration command.
If you have a LECS or LES/BUS configured on an ATM module and you replace the supervisor
engine (on Catalyst5000 series switches only) or move the ATM module from one slot to another,
the ATM addresses (NSAPs) are modified. Be sure to update the LECS database configuration with
the new NSAP values.
ATM modules do not generate link up/down traps.
UplinkFast is not supported over ATM.
In a 10 BASE-2 network, incorrect termination can cause the port to hang. To recover, disable and
then reenable the port.