Problem with bonded (teaming) NIC's on RHEL 4.0

[Carel Lubbe]

Hi Anne,

Yes is the answer......
I think mii-tool has a problem with GIG speeds.
I have two NICs on my server eth0 and eth1
The switch they connect to show they have negotiated a GIG connection 
When you run mii-tool for eth0 and eth1 it does not show that.

# mii-tool eth0
eth0: negotiated 100baseTx-FD flow-control, link ok
# mii-tool eth1
eth1: negotiated 100baseTx-FD flow-control, link ok

But if you use the more up to date ethtool you get a true report of eth0 and eth1

# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: g
        Wake-on: g
        Link detected: yes
# ethtool eth1
Settings for eth1:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: g
        Wake-on: g
        Link detected: yes

I recon because the bond0 device is not a real device these tools cannot report correctly as its used by the OS depending on the bonding mode you set the interface up as to represent the real eth0 and eth1 to the OS as fail over or load balanced.  

On Tuesday 17 November 2009 11:58:51 Anne Moore wrote:
> Hello Carel
> 
> Thanks for the reply.
> 
> So, even though yours also say "10Mbit half-duplex" when running the
> mii-tool bond0 command, you are actually getting full gigi speed still? 
> 
> Did you setup round robin as your mode option?
> 
> Thanks
> 
> Anne
> 
> -----Original Message-----
> From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]
> On Behalf Of Carel Lubbe
> Sent: Sunday, November 15, 2009 11:19 PM
> To: General Red Hat Linux discussion list
> Subject: Re: Problem with bonded (teaming) NIC's on RHEL 4.0
> 
> Hi Anne,
> 
> I had the same thing with mii-tools and with ethtools
> http://wiki.centos.org/TipsAndTricks/BondingInterfaces
> 
> I did check throughput on the switch and i do get GIG speeds 
> 
> Cheers,
> Carel
> 
> 
> 
> On Monday 16 November 2009 16:11:22 Anne Moore wrote:
> > Hi all RH experts,
> >  
> > I have bonded my two GIGI speed nic's on my red hat enterprise 4.0 server.
> > They were (before the bonding) running at 1 GIGI speed. However, now 
> > that they are bonded together, it runs at 10Mbits. I used this procedure:
> > http://www.cyberciti.biz/tips/linux-bond-or-team-multiple-network-inte
> > rfaces
> > -nic-into-single-interface.html
> >  
> > I get the 10Mbits result when running the command mii-tool bond0. 
> >  
> > Any ideas what the problem here is? Or why I'm only getting 10Mbits now? 
> >  
> > Thank you for your assistance.
> >  
> > Anne
> --
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