[TriLUG] DHCP timeout with 10g hardware on rhel family

[Maxwell Spangler]

On Thu, 2011-04-21 at 15:20 -0400, Jimmy Dorff wrote:
> On Wed, 2011-04-20 at 21:13 -0400, Carl Crider wrote:
> > Driver, perhaps.
> > 
> > Looks like a new one dropped on 4/11
> > 
> > http://tinyurl.com/3umh6tv*
> > 
> 
> Thanks. I just tried that version and also a current mainline kernel
> from elrepo (2.6.38-3.el5.elrepo) but I still see the same behavior. 
> 
> I think this may be a switch issue as much as a device issue. This is
> 10G over cat6 (short runs), so it's fairly new hardware all around.
> 
> I did find a clean method to add a delay to allow the link to come up.
> In /etc/sysconfig/network-scripts/ifcfg-ethX add:
> 
> LINKDELAY=5
> 
> and the scripts give a 5 second sleep after bringing the device up. So
> far this is working for me with the intel 82598EB. 

Check for firmware upgrades to the card and switch, as well.  You'd be
surprised how many issues can be fixed with firmware upgrades.

FWIW, I have a few 10G cards that have similar problems.  Haven't
resolved the issue yet, but your LINKDELAY is nice to know about!


-- 
Maxwell Spangler
========================================================================
        Linux System Administration / Computing Services
        Photography / Graphics Design / Writing
        Boulder, Colorado
        http://www.maxwellspangler.com