EasyManuals Logo

Cisco Catalyst 2960-L Series User Manual

Cisco Catalyst 2960-L Series
80 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #58 background imageLoading...
Page #58 background image
Switch Performance
Speed, Duplex, and Autonegotiation
If the port statistics show a large amount of alignment errors, frame check sequence (FCS), or late-collisions
errors, this might mean a speed or duplex mismatch.
A common issue with speed and duplex occurs when duplex and speed settings are mismatched between two
switches, between a switch and a router, or between the switch and a workstation or server. Mismatches can
happen when manually setting the speed and duplex or from autonegotiation issues between the two devices.
To maximize switch performance and to ensure a link, follow one of these guidelines when changing the
duplex or the speed settings.
Let both ports autonegotiate both speed and duplex.
Manually set the speed and duplex parameters for the interfaces on both ends of the connection.
If a remote device does not autonegotiate, use the same duplex settings on the two ports. The speed
parameter adjusts itself even if the connected port does not autonegotiate.
Autonegotiation and Network Interface Cards
Problems sometimes occur between the switch and third-party network interface cards (NICs). By default,
the switch ports and interfaces autonegotiate. Laptops or other devices are commonly set to autonegotiate,
yet sometimes autonegotiation issues occur.
To troubleshoot autonegotiation problems, try manually setting both sides of the connection. If this does not
solve the problem, there could be a problem with the firmware or software on your NIC. You can resolve this
by upgrading the NIC driver to the latest version.
Cabling Distance
If the port statistics show excessive FCS, late-collision, or alignment errors, verify that the cable distance
from the switch to the connected device meets the recommended guidelines.
Finding the Switch Serial Number
If you contact Cisco Technical Assistance, you need to know the switch serial number. You can also use the
show version privileged EXEC command to see the switch serial number.
Cisco Catalyst 2960-L Series 8-Port and 16-Port Switch Hardware Installation Guide
46
Troubleshooting
Switch Performance

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Cisco Catalyst 2960-L Series and is the answer not in the manual?

Cisco Catalyst 2960-L Series Specifications

General IconGeneral
SeriesCatalyst 2960-L
Ports8, 16, 24, or 48 Gigabit Ethernet ports
LayerLayer 2
Flash Memory64 MB
MAC Address Table Size8, 000 entries
Uplink2 or 4 Gigabit SFP
PoEAvailable on selected models
VLAN SupportUp to 255 VLANs
Power SupplyInternal power supply
Operating Temperature0°C to 40°C (32°F to 104°F)
Dimensions44.5 x 27.9 x 4.45 cm (17.5 x 11.0 x 1.75 in.)

Related product manuals