This states the interface's assigned role in the fabric topology — essentially whether it is a server-facing (compute) link or a network-facing uplink. For this chassis slot's endpoint for whatever blade currently occupies it, ifRole tells you which traffic pattern to expect: a server-facing role means the far end is blade hardware and its bandwidth serves one chassis, while a network role means it's carrying aggregated traffic upstream. For a blade backplane port this would read 'server', distinguishing it from the network-role uplinks connecting the fabric interconnect to the LAN/SAN core.