I think there may be a terminology issue here. When you write switch, do you mean some chassis based switch ? Chassis based switches (commonly anything larger than 36 or 38 4x switch ports) is a conglomeration of individual switches. Chassis based switches have spine cards (internal connectivity) and line cards (external connectivity). Internally connected switches are interconnected by etch between switches on a single PCB or by backplane traces. External ports are connected via cables of some sort. You should be able to see all this with ibnetdiscover. If the chassis based switch is supported by ibnetdiscover, you can even try -g option. Regardless of whether it's an internal or external connection, you just need to find the right port numbers on the peer IB devices to query the port counters.
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