Service Manual

• To view the disabled ports, you can use thedisabled-ports keyword with the show system stack-unit 0 command.
• Before you congure the last available port in Quad mode, you are prompted to conrm whether you want to congure the port
Fanout mode, as shown in the following example.
Dell(conf)#stack-unit 0 port 0 portmode quad
Maximum number of ports that can be made Quad mode in the range <0-63> is configured.
Ports 12,16,60, will be disabled on reload.
Do you wish to continue? [confirm yes/no]:yes
Please save and reset unit 0 for the changes to take effect.
The following gure shows 26 ports congured in Quad mode. Ports X(52, 56, 60) and Y( 64, 68, 72) are disabled (shown in red).
Figure 130. Port congured in Quad mode.
Backward Compatibility With Enhanced Fanout Conguration
When you congure fanout on the ports in which fanout is not supported in releases of Dell Networking OS earlier than Release
9.4(0.0), downgrade to an earlier release might cause an unexpected behavior. This phenomenon occurs because in Release 9.4(0.0),
static conguration for the restricted ports is maintained. Validation of the restricted ports is performed at the CLI level and not
during bootup. Therefore, increased fanout conguration on ports is not backward-compatible.
If you want to perform a downgrade from Release 9.3(0.0) to 9.0(2.0), Dell Networking recommends removing the fanout
conguration on the ports that were previously not enabled for fanout. However, if you want to perform a downgrade from Release
9.4(0.0) to Release 9.3(0.0), you must not remove fanout on restricted ports. Fanout conguration in NVRAM is not reset for ports
4, 12, 20, 28, 100, 108, 116, and 124, the ports where fanout conguration is not allowed. The ports are reset and considered as 40G
ports.
Conguring Fanout on Disabled Ports
When you congure fanout on the maximum permissible number of 40G ports, the remaining ports are disabled on the port pipe. If
you want to congure fanout on the disabled ports, you must rst enable the disabled ports by removing the fanout setting from the
active ports and then recongure fanout on the desired port. This operation requires you to reboot the system twice: once to enable
the port and another time to congure fanout because the fanout setting becomes eective only after a reboot. You can avoid this
situation by conguring the disabled ports to be in Quad mode if you don not exceed the maximum limit on fanout ports.
When you use the show hardware stack-unit 0 drops unit 0 command, you do not need to know which are 40G ports
because the limitation in Release 9.3(0.0) is no longer valid. The following sample output displays the user port and system port
mapping if you congure all the ports as 40G.
Dell#show hardware stack-unit 0 drops unit 0
890
S-Series Debugging and Diagnostics