
This phenomenon occurs because in Release 9.4(0.0), static configuration for the restricted ports is
maintained. Validation of the restricted ports is performed at the CLI level and not during bootup.
Therefore, increased fanout configuration 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 configuration 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 configuration in NVRAM is not reset for ports 4, 12, 20, 28, 100, 108, 116, and
124, the ports where fanout configuration is not allowed. The ports are reset and considered as 40G
ports.
Configuring Fanout on Disabled Ports
When you configure fanout on the maximum permissible number of 40G ports, the remaining ports are
disabled on the port pipe. If you want to configure fanout on the disabled ports, you must first enable the
disabled ports by removing the fanout setting from the active ports and then reconfigure fanout on the
desired port. This operation requires you to reboot the system twice: once to enable the port and
another time to configure fanout because the fanout setting becomes effective only after a reboot. You
can avoid this situation by configuring 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know which are 40G ports because the limitation in Release 9.3(0.0) is no longer valid.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 configure all the ports as 40G.
Dell#show hardware stack-unit 0 drops unit 0
UserPort PortNumber Ingress Drops IngMac Drops Total Mmu Drops EgMac Drops
Egress Drops
0 1 0 0 0 0
0
4 5 0 0 0 0
0
8 9 0 0 0 0
0
12 13 0 0 0 0
0
16 17 0 0 0 0
0
20 21 0 0 0 0
0
24 25 0 0 0 0
0
28 29 0 0 0 0
0
32 33 0 0 0 0
0
36 37 0 0 0 0
0
40 41 0 0 0 0
0
44 45 0 0 0 0
0
48 49 0 0 0 0
0
52 50 0 0 0 0
0
56 51 0 0 0 0
S-Series Debugging and Diagnostics
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