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SNAP-Encapsulated Packet Conversion Across the
FDDI Ring
In accordance with the IEEE 802.1 bridging standard, FDDI SNAP packets are
translated to Ethernet II packets when bridging between FDDI and Ethernet
segments. Packets originating on Ethernet with SNAP encoding will arrive as
Ethernet II packets after traversing the FDDI ring, which may cause
connectivity problems.
Client
Switch
Node
1
Traffic
Generated
as SNAP
Packets...
FDDI Module OS Version
The FDDI Module is shipped with and uses its own OS (operating system)
software. The version number of this software must be the same as the OS
software version being used by the Switch 2000. (The earliest version
supporting FDDI operation is A_02_01.) Normally, if you upgrade the Switch
2000 software before installing a new FDDI Module, the module and switch
will be compatible (unless the switch software predates the module software).
If an FDDI Module and supporting software has previously been installed, and
you then upgrade the Switch 2000 software, the FDDI Module software will
automatically be updated as well, and the software version number for the
Switch 2000 and for the FDDI Module should match. If the version numbers
do not match, then faulty FDDI operation may occur.
To determine the current FDDI Module software version:
4.
In the Main Menu of the console interface, select Statistics to display
the Statistics screen.
5.
In the Statistics screen, select Module Description to display the
Module Description screen. You will then see a display similar to the
following, in which you can identify the current software (OS) version in
use with the FDDI Module.
Troubleshooting
Server
Switch
Node
2
...is
received as
Ethernet 2
Packets
25
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