Why can't I read /sys/class/net/$NIC_DEVICE/phys_port_id?

Solution Unverified - Updated -

Issue

  • Why can't I read /sys/class/net/$NIC_DEVICE/phys_port_id?

Sample log:

# ethtool -i ens3 | head -2
driver: e1000
version: 7.3.21-k8-NAPI
# cat /sys/class/net/ens3/phys_port_id
cat: /sys/class/net/ens3/phys_port_id: Operation not supported

Environment

  • Red Hat Enterprise Linux 7

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