"ip link" reports "RTNETLINK answers: No such device Cannot send link get request: No such device" with alias interface

Issue

• "ip link" reports "RTNETLINK answers: No such device Cannot send link get request: No such device" with alias interface
• System with ethX:Y style alias interface can no longer show the alias interface as of RHEL 7.6 iproute package:

Old behaviour:

# ./ip/ip link show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether aa:bb:cc:dd:ee:ff brd ff:ff:ff:ff:ff:ff

# ./ip/ip link show eth1:1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether aa:bb:cc:dd:ee:ff brd ff:ff:ff:ff:ff:ff

New behaviour:

# ./ip/ip link show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether aa:bb:cc:dd:ee:ff brd ff:ff:ff:ff:ff:ff

# ./ip/ip link show eth1:1
RTNETLINK answers: No such device
Cannot send link get request: No such device