Interface Physical State Troubleshooting Table

Admin State Physical State ip link show Output
up up
swp1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 500
up down
swp1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT qlen 500
down up
swp1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT qlen 500
down down
swp1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT qlen 500

Warning Notice how Admin down and down/down look identical.

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Hi All, I like to spend time on black and white screen with linux. I love to learn new things in linux specially in virtualization. Currently I am working on OpenStack like to dig deep.

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