Sostanzialmente se si ha il primo link attivo, la tengiga 5/1, e se si tenta di attivare anche il secondo, tengiga 5/2, questa seconda intefaccia non funzionerà e lo status sarà inactive.
La spiegazione che Cisco fornisce è la seguente:
The TenGig interfaces on the SUP6-E are controlled by a stub ASIC which merges back to a single ASIC within the switch. This creates a limitation to where you can only have one of the TenGig interfaces (per sup) running at line rate. Another limitation to this design is that you cannot mix TenGig and X2 (Gig) at the same time on the same sup.
You can, however, activate both of your TenGig interfaces by placing the switch in a shared backplane mode. This will give you access to both of your interfaces but only in an oversubscribed mode (2:1).
The command to place the switch in shared backplane:
Switch(config)#hw-module uplink mode shared-backplane
After the command is entered (and you reload your switch) you should see something similar to the following for theshow hw-module module port-group command.
Module Port-group Active Inactive
-------------------------------------------------------------
5 1 Te5/1-2 Gi5/3-6
E' dunque necessario far si che la scheda abbia un backplane condiviso per avere attive entrambe le interfacce in una modalità denominata "oversubscribed" 2:1
Dunque basterà inserire il seguente comando:
Switch(config)#hw-module uplink mode shared-backplane
(necessita il riavvio della supervisor)
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