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Cisco Catalyst Switch Compatibility and Operation−Specific
Issues
These sections deal with specific Cisco Catalyst switch issues that can affect performance, compatibility, and
interoperation of certain NICs.
Catalyst 8510 and 8540 CSR
In the campus switch router (CSR) Cisco IOS Software Release 12.0(5)W5(13), autonegotiation for speed and
duplex are enabled by default. In earlier releases, autonegotiation is not supported by default. As a result, each
connected interface must be set to run in full−duplex mode. If you upgrade to Cisco IOS Software Release
12.0(5)W5(13) with a router that runs in manually full−duplex mode, you experience performance issues. The
symptoms include high collision rate, reduced throughput, and more packet drops. This is because the
Catalyst 8500 waits to autonegotiate with the connected device. Now that the connected device is forced to
run in full−duplex mode, it does not participate in autonegotiation. Based on the specification, this causes the
Catalyst 8500 interface to settle in half−duplex mode, which causes a mismatch between the device and the
Catalyst 8500 at the interface level. Catalyst 8500 interface defaults to half−duplex mode when the peer is
incapable of negotiation.
Catalyst 6000 and 6500 Switches
This table describes Cisco bug IDs found on the Catalyst 6000 and 6500 switches.
Table 7
Cisco Bug ID Resolved
In
Description
CSCdm48887
(
registered
customers only
) 5.2.3,
5.3.1a
When a port goes into the
errdisable state on a Catalyst
6000 or 6500, the switch
inadvertently learns the MAC
addresses of other devices to be
learned from the errdisable
port. The errdisable state is
caused by excessive late collisions
on a port. Since all traffic on that
VLAN is forwarded incorrectly out
of the incorrect port, there is a loss
of connectivity. This errdisable
state can appear as a result of a
duplex mismatch or faulty NIC.
CSCdm80035
(
registered
customers only
) 5.2.3,
5.3.1a
When a Gigabit connection is reset
on a Catalyst 6000 or 6500, the
connection can potentially not
reconnect. A symptom of this issue
can be that a Gigabit NIC does not
connect after reset or disconnect.
CSCdm88013
(
registered
customers only
)
5.2.3,
5.3.1a
Occasionally, host NICs connected
to WS−X6248−TEL or
WS−X6248−RJ−45 modules can
incorrectly revert to half−duplex