Appendix B Troubleshooting
443
•To establish a full-duplex link either force it at both sides, or run
autonegotiation on both sides (using full-duplex as an advertised
capability, the default setting).
Always verify that the
switch and the network
device match in
configuration for speed
and duplex.
•A mismatch of duplex mode between the 480T routing switch and
another network device will cause poor network performance. View
statistics using:
show port rx
If it displays a constant increment of CRC errors, it is a duplex
mismatch between devices, rather than a problem with the 480T
routing switch.
What if no link light shows on a 1000 Mbps fiber port?
•Check to ensure that the transmit fiber goes to the receive fiber side
of the other device, and vice-versa.
•The switch has autonegotiation set to on by default for 1000 Mbps
ports. Set these ports to auto off (using the command configure
port <port #> auto off) if you are connecting to devices that
do not support autonegotiation.
•Ensure that you are using multi-mode fiber (MMF) when using a
1000BASE-SX GBIC, and single mode fiber (SMF) when using a
1000BASE-LX GBIC. 1000BASE-SX does not work with SMF.
1000BASE-LX works with MMF, but requires you to use a mode
conditioning patchcord (MCP).
OSPF (Open Shortest Path First)
When setting up OSPF areas, it indicates the area must be in an
IP-type format. That differs from some non-Intel equipment.
How do I convert an OSPF area into an IP-type format?
The 480T routing switch must have the OSPF area ID input in IP
dotted decimal notation. Some non-Intel equipment may show this as
a whole number. To convert OSPF whole numbers to dotted decimal
notation:
•Convert the non-IP type format using a decimal to binary
converting method, for example, to convert 400 decimal into
binary (110010000). The binary number needs to show 32 digits,
representing the digits of the 4 octets in the IP-type format.
110010000 binary = 00000000.00000000.0000001.10010000 as
broken into octets.