SET MODULE {slot.sublsot} NETWORK {ethernet_n} orSET PORT {slot.port} NETWORK {ethernet_n}
Before assigning the port or module to a network you may use the following
management command to display the availability of the Ethernet segments on
the Enhanced TriChannel and the ShuntBus:
SHOW BACKPLANE_PATHS ETHERNET
An example of the output from this command is shown in Figure 5.
 
8260> show backplane_paths ethernet
Physical Path Logical Network
--------------- ---------------
ETHERNET_PATH_1 ETHERNET_1
ETHERNET_PATH_2 in use
ETHERNET_PATH_3 in use
ETHERNET_PATH_4 available
ETHERNET_PATH_5 ETHERNET_5
ETHERNET_PATH_6 ETHERNET_6
ETHERNET_PATH_7 ETHERNET_7
ETHERNET_PATH_8 ETHERNET_8
8260>
 
Figure 5. Backplane Path Display for Ethernet Segments
In this example, the Ethernet segments shown ″in use″ are not available to be
used for setting up Ethernet segments in this hub due to the backplane pins
corresponding to these segments being currently used by other segment types
such as token-ring and/or FDDI. Ethernet_1 and ethernet_5 through ethernet_8
are currently configured to be used by Ethernet modules in this hub. The pins
available to be used by ethernet_4 are not currently configured to be used by
any network type.
To connect and use the Ethernet segments on the backplane (Enhanced
TriChannel or ShuntBus) various techniques are used by the various 8250 and
8260 Ethernet modules. These techniques can be categorized into one of the
three following methods:
•Method 1:
This method uses 14 pins on the backplane to set up an Ethernet segment.
In this method, each module attached to the Ethernet segment will send the
slot-id and port-id of the transmitting station in

parallel

over the backplane.
The slot-id will use 5 pins and the port-id will use 4 pins on the backplane as
shown in Table 2 on page 17.
The slot-id will be used to perform

digital collision detection

as described in
2.2.1, “Digital Collision Detection” on page 19. Additionally, the slot-id and
the port-id will be used by the management module to perform statistics
gathering about the segment as well as the individual ports and modules on
that segment as described in 2.2.3, “Statistics Collection” on page 19.
This method is used by all 8250 modules and is only allowed on ethernet_1,
ethernet_2, and ethernet_3 segments on the Enhanced TriChannel.
Therefore, the 8250 Ethernet modules installed in the 8260 can only be
assigned to these three segments and can not be assigned to Ethernet
16 8260 Multiprotocol Intelligent Switching Hub