3com 3031 Instruccion De Instalación
130
C
HAPTER
13: LAN I
NTERFACE
C
ONFIGURATION
Configuration procedure
1 Assign the IP address 192.168.0.1 to Ethernet 0/0/0, given the mask is
255.255.0.0.
[3Com]interface ethernet 0/0/0
[3Com-Ethernet0/0/0]ip address 192.168.0.1 255.255.0.0
2 Set the MTU on the interface to 1492 bytes.
[3Com-Ethernet0/0/0]mtu 1492
Troubleshooting
You can perform the following operations to determine the correctness of the
Ethernet interface.
Ethernet interface.
■
Ping the Ethernet interface on the router from a host locating on the same
LAN, anticipating that all the packets can be correctly returned.
LAN, anticipating that all the packets can be correctly returned.
■
Look up the statistics of the connected two parties (router and switch for
example), anticipating that the received error frames have not rapidly
increased.
example), anticipating that the received error frames have not rapidly
increased.
If the test result of either item is incompliance with the anticipation, you can
conclude that the Ethernet interface or its connection is not properly working.
conclude that the Ethernet interface or its connection is not properly working.
After confirming the existence of a fault, you can isolate it following these steps:
1 Check that the LAN connection between the host and the router is correct.
If the Ethernet is connected to a hub or LAN Switch, check the ON/OFF status of
the LEDs for the link to the hub or LAN Switch.
the LEDs for the link to the hub or LAN Switch.
ON LEDs mean that the Ethernet
interface between the host and the router and the network cable are physically
normal. Otherwise, please replace such physical devices as the network adapter,
network cable, router or the relevant interface module.
normal. Otherwise, please replace such physical devices as the network adapter,
network cable, router or the relevant interface module.
If the Ethernet is connected using Unshielded Twisted Pair (UTP) and if at least one
of the connection parties supports 100Base-TX, rate matching must be taken into
consideration.
of the connection parties supports 100Base-TX, rate matching must be taken into
consideration.
An operating rate mismatch between the two parties, i.e., one is
working at 100 Mbps and the other at 10 Mbps, will cause faults. From the
perspective of the one working at 100 Mbps, no connection can be set up. From
the perspective of the one working at 10 Mbps, the connection can be set up but
the physical layer activity LED (ACTIVE) will keep blinking quickly and data
transmission and receipt cannot be carried out properly.
perspective of the one working at 100 Mbps, no connection can be set up. From
the perspective of the one working at 10 Mbps, the connection can be set up but
the physical layer activity LED (ACTIVE) will keep blinking quickly and data
transmission and receipt cannot be carried out properly.
When looking for the connection problems of FE interface on 3Com Series
Routers, there are two prompt messages that are very helpful.
Routers, there are two prompt messages that are very helpful.
These two
messages are displayed on the Console screen upon your operation of selecting
speed or connecting network.
speed or connecting network.
Ethernet 0/0/0: Warning--the link partner do not support 100M mode
Ethernet 0/0/0: Warning--the link partner may not support 10M mode
The first prompt message indicates that the Ethernet interface on the 3Com Series
Router has detected that the remote end does not support 100Mbps operating
speed, but the local end is forced to work at 100Mbps. In this case, you should
ensure the remote end to make the same configuration so that it can work at 100
Mbps. The second prompt message indicates that the Ethernet interface on the
3Com Series Router has detected that the remote end does not support 10Mbps
operating speed, but the local end is forced to work at 10Mbps.
Router has detected that the remote end does not support 100Mbps operating
speed, but the local end is forced to work at 100Mbps. In this case, you should
ensure the remote end to make the same configuration so that it can work at 100
Mbps. The second prompt message indicates that the Ethernet interface on the
3Com Series Router has detected that the remote end does not support 10Mbps
operating speed, but the local end is forced to work at 10Mbps.
In this case, the
user should ensure that the remote end can work at 10Mbps.
However, when the