Solving Communication Problems - 3Com 4210 Getting Started

54 C 4: P
HAPTER ROBLEM
Solving
Communication
Problems
S
OLVING
Error message indicating that the SFP transceiver is invalid
The switch has identified that the SFP does not meet the minimum requirements
for the switch and has disabled the port. To correct this problem, completely
remove the SFP and replace it with a 3Com approved SFP.
Error message indicating that the SFP transceiver is faulty
To correct this problem, completely remove the SFP and then reinsert it.
Alternatively, insert another identical SFP. If the problem persists, contact 3Com
Technical Support.
If you experience communication problems with the switch, ensure that:
The switch IP address and Management VLAN ID has been configured.
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If the switch is separated from your management application by a router,
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ensure that the default gateway IP address within the switch is the same as the
IP address of the router.
The switch's IP address was discovered correctly by your network management
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application.
The following is a brief overview of IP addressing, and how to obtain a registered
IP address.
IP Addressing
To be managed correctly, each device on your network (for example a switch or
Hub) must have a unique IP address. IP addresses have the format n.n.n.n where n
is a decimal number between 0 and 255. An example IP address is 192.168.100.8.
The IP address is split into two parts:
The first part ('192.168.100' in the example) identifies the network on which
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the device resides
The second part ('.8' in the example) identifies the device within the network
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The natural subnet mask for this example is 255.255.255.0.
If your network has a connection to the external IP network, that is, you access the
Internet, you must apply for a registered IP address.
How do you obtain a registered IP Address?
The IP registration system ensures that every IP address used is unique; if you do
not have a registered IP address, you may be using an identical address to
someone else and your network will not operate correctly.
InterNIC Registration Services is the organization responsible for supplying
registered IP addresses. The following contact information is correct at time of
publication:
World Wide Web site: http://www.internic.net
If your IP network is internal to your organization only, that is, you do not access
the Internet, you may use any arbitrary IP address as long as it is not being used by