I'm pretty sure the answer is b). You really don't want non-fabric cards in a SFM 6500. Although even without the fabric being enabled, you'd really need a lot of traffic to saturate the 6500s backplane. What does SHOW TRAFFIC say?
There are configuration commands to determine how packets are handle between 2 SFM enable ports and 1 SFM enable port and 1 non-SFM enabled ports.
To configure the switch to use flow-through mode if you have non-fabric enabled modules installed, perform this task:
set system switchmode allow bus-only
From the below link I belive the switch uses truncated mode to switch packets between SFM-enabled modules and the flow-through for all others. It's not really clear. Can we get someone from Cisco to clarify??
Hey Cisco, what is the answer? Do you need all modules to be SFM-enable for the SFM to get 256Mbps between any 2 SFM-enabled ports??
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