ethtool - Link detected: no

[Paul Preston]

It might be the case that MIIMon is not supported. From RHEL 6 Deployment guide (section about bonding directives, page 399):
Specifies (in milliseconds) how often MII link monitoring occurs. This is useful if high availability is
required because MII is used to verify that the NIC is active. To verify that the driver for a particular
NIC supports the MII tool, type the following command as root:
~]# ethtool <interface_name> | grep "Link detected:"
In this command, replace <interface_name> with the name of the device interface, such as
eth0, not the bond interface. If MII is supported, the command returns:
Link detected: yes

Kind Regards,
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-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On Behalf Of Allen Chen
Sent: 01 March 2011 16:18
To: General Red Hat Linux discussion list
Subject: Re: ethtool - Link detected: no

nani wrote:
> Check with the Network team, from switch side what will be the
> settings like 100 base full duplex and through ethtool command set
> those values
>
> and see you will get the link detected = yes
>
>
>
> On Mon, Feb 28, 2011 at 3:01 PM, Parvez Shaikh <parvez.h.shaikh at gmail.com>wrote:
>
>
>> Hi all,
>>
>> When I run ethtool against ethernet card, I get following output -
>>
>> [root at datablade1 ~]# ethtool eth3
>> Settings for eth3:
>>        Supported ports: [ FIBRE ]
>>        Supported link modes:   1000baseT/Full
>>        Supports auto-negotiation: Yes
>>        Advertised link modes:  1000baseT/Full
>>        Advertised auto-negotiation: Yes
>>        Speed: Unknown!
>>        Duplex: Unknown! (255)
>>        Port: FIBRE
>>        PHYAD: 2
>>        Transceiver: internal
>>        Auto-negotiation: on
>>        Supports Wake-on: g
>>        Wake-on: g
>> *        Link detected: no*
>>
>> Note "Link detected: no"; what does it mean?
>>
>> When I do ethtool -t eth3, I get following output -
>>
>> [root at datablade1 ~]# ethtool -t eth3
>> *The test result is FAIL*
>> The test extra info:
>> register_test (offline)  0
>> memory_test (offline)    0
>> loopback_test (offline)  0
>> nvram_test (online)      0
>> interrupt_test (online)  0
>> link_test (online)       1
>>
>> Note "*The test result is FAIL", *somehow I believe the above two
>> outputs are interlinked (the test result is FAIL because link detected is 'No').
>>
>> How to fix this to make test result pass and link detected to 'Yes'?
>> For other ethernet card I can see the test result passing and link
>> detected is 'Yes'
>>
>> Thanks
>> Parvez
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>>
>>
You can try to update the latest firmware on those network cards.
I have a HS20 blade, and I use bonding to do the failover.
for somehow, "Link detected" is not stable(it's stable if I remove bonding).
After I updated it to the latest firmware, "Link detected" is stable.
and bonding is working fine.

Allen

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