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> typedef std::string PortDirection;
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> PortDirection src_outport_dirn;
> PortDirection dst_inport_dirn;
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< void addLink(SwitchID src, SwitchID dest, BasicLink* link);
---
> void addLink(SwitchID src, SwitchID dest, BasicLink* link,
> PortDirection src_outport_dirn = "",
> PortDirection dest_inport_dirn = "");