Extreme Networks 200 Series - Manual (Page 320)

236 Summit 200 Series Switch Installation and User Guide
Troubleshooting
NOTE
A mismatch of duplex mode between the Extreme switch and another network device will cause poor
network performance. Viewing statistics using the
show port rx command on the Extreme switch may
display a constant increment of CRC errors. This is characteristic of a duplex mismatch between
devices. This is NOT a problem with the Extreme switch.
Always verify that the Extreme switch and the network device match in configuration for speed and
duplex.
No link light on Gigabit fiber port:
Check to ensure that the transmit fiber goes to the receive fiber side of the other device, and vice-versa.
All gigabit fiber cables are of the cross-over type.
The Extreme switch has auto-negotiation set to on by default for gigabit ports. These ports need to be
set to auto off (using the command
config port <port #> auto off ) if you are connecting it to
devices that do not support auto-negotiation.
Ensure that you are using multi-mode fiber (MMF) when using a 1000BASE-SX Mini-GBIC.
1000BASE-SX does not work with single-mode fiber (SMF).
VLANs
You cannot add a port to a VLAN:
If you attempt to add a port to the “default” VLAN and get an error message similar to
Summit200-24:28 # config vlan default add port 1
ERROR: There is a protocol conflict with adding port 1 untagged to VLAN default
you already have a VLAN using untagged traffic on this port. Only one VLAN using untagged traffic
can be configured on a single physical port.
VLAN configuration can be verified by using the following command:
show vlan <name>
The solution for this error is to remove port 1 from the VLAN currently using untagged traffic on the
port. If this were the “default” VLAN, the command would be
Summit200-24:30 # config vlan default del port 1
which should now allow you to re-enter the previous command without error as follows:
Summit200-24:31 # config vlan red add port 1
VLAN names:
There are restrictions on VLAN names. They cannot contain whitespaces and cannot start with a
numeric value unless you use quotation marks around the name. If a name contains whitespaces, starts
with a number, or contains non-alphabetical characters, you must use quotation marks whenever
referring to the VLAN name.