Port Configuration - Extreme Networks ExtremeWare XOS Guide Manual

Excessive RX CRC errors:
When a device that has autonegotiation disabled is connected to an Extreme Networks switch with
autonegotiation enabled, the Extreme Networks switch links at the correct speed, but in half-duplex
mode. The Extreme Networks switch 10/100 physical interface uses a method called parallel detection to
bring up the link. Because the other network device is not participating in autonegotiation (and does
not advertise its capabilities), parallel detection on the Extreme Networks switch is able only to sense
10 Mbps versus 100 Mbps speed and not the duplex mode. Therefore, the switch establishes the link in
half-duplex mode using the correct speed.
The only way to establish a full-duplex link is either to force it at both sides, or run autonegotiation on
both sides (using full-duplex as an advertised capability, which is the default setting on the Extreme
Networks switch).
NOTE
A mismatch of duplex mode between the Extreme switch and another network device causes poor network
performance. Viewing statistics using the
display a constant increment of CRC errors. This is characteristic of a duplex mismatch between devices. This is
NOT a problem with the Extreme Networks switch.
Always verify that the Extreme Networks switch and the network device match in configuration for
speed and duplex.
No link light on Gigabit fiber port:
Check that:
The transmit fiber goes to the receive fiber side of the other device and vice-versa. All Gigabit fiber
●
cables are of the crossover type.
The Gigabit ports are set to Auto Off (using the command
●
off speed [10 | 100 | 1000 | 10000] duplex [half | full]
Extreme Networks switch to devices that do not support autonegotiation.
By default, the Extreme Networks switch has autonegotiation set to On for Gigabit ports and set to
Off for 10 Gigabit ports.
You are using multimode fiber (MMF) when using a 1000BASE-SX Gigabit Ethernet Interface
●
Connector (GBIC), and single-mode fiber (SMF) when using a 1000BASE-LX GBIC. 1000BASE-SX
technology does not work with SMF. The 1000BASE-LX technology works with MMF but requires
the use of a mode conditioning patchcord (MCP).
VLANs
You cannot add a port to a VLAN:
If you attempt to add a port to a VLAN and get an error message similar to:
localhost:7 # configure vlan marketing add ports 1:1,1:2
Error: Protocol conflict when adding untagged port 1:1. Either add this port as tagged
or assign another protocol to this VLAN.
you already have a VLAN using untagged traffic on a port. Only one VLAN using untagged traffic can be
configured on a single physical port.
ExtremeWare XOS 11.3 Concepts Guide
command on the Extreme Networks switch may
show ports rxerrors
Using the Command Line Interface
configure ports <port_list> auto
) if you are connecting the
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