Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH 사용자 설명서
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Appendix C. Troubleshooting
NETGEAR 8800 User Manual
When a device that has autonegotiation disabled is connected to an NETGEAR switch with
autonegotiation enabled, the NETGEAR switch links at the correct speed, but in half-duplex
mode. The NETGEAR 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 NETGEAR
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.
autonegotiation enabled, the NETGEAR switch links at the correct speed, but in half-duplex
mode. The NETGEAR 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 NETGEAR
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 NETGEAR switch).
autonegotiation on both sides (using full-duplex as an advertised capability, which is the
default setting on the NETGEAR switch).
Note:
A mismatch of duplex mode between the XCM8800 switch and
another network device causes poor network performance. Viewing
statistics using the
statistics using the
show ports rxerrors
command on the
XCM8800 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 switch.
This is characteristic of a duplex mismatch between devices. This is
NOT a problem with the switch.
Always verify that the switch and the network device match in configuration for speed and
duplex.
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
configure ports <port_list>
{medium [copper | fiber]} auto off speed <speed> duplex [half | full]
) if you are
connecting the switch to devices that do not support autonegotiation.
By default, the XCM8800 has autonegotiation set to On for Gigabit ports and set to Off for
10 Gigabit ports.
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).
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).
Software License Error Messages
You do not have the required software license:
If you attempt to execute a command and you do not have the required license, the switch
returns the following message:
returns the following message: