- Our Intel
igb-based interfaces can be set down, but still show link up on the switch:
hostname# ip link show dev eth2 | grep mtu 4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000 hostname# ethtool eth2 | grep detected Link detected: yes switch-> show interfaces 1/23 Slot/Port 1/23 : Operational Status : up, hostname# ip link set eth2 down hostname# ip link show dev eth2 | grep mtu 4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000 hostname# ethtool eth2 | grep detect Link detected: no switch-> show interfaces 1/23 Slot/Port 1/23 : Operational Status : up,
This was reviewed by someone from our hardware team, and it seems that this issue is caused by a specific hardware configuration (a config bit in the
MANCregister of the EEPROM) that retains power to the PHY even when the interface is taken down to support SOL (Serial-Over-LAN).
Is there a way to change/override this behavior in the driver from the OS?
- Red Hat Enterprise Linux 6.4
- Intel network interface with
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