Channel-bonding/VLAN with Scyld

Horatio B. Bogbindero wyy at cersa.admu.edu.ph
Thu Jul 12 10:44:54 EDT 2001


On Thu, Jul 12, 2001 at 03:36:41PM +0200, Jerker Nyberg wrote (wyy sez):
> 
> Sorry if I've missed something important here, but why isn't it possible
> to use ordinary routing instead of channel bonding to split the traffic
> between interfaces?
> 
> According to http://snafu.freedom.org/linux2.2/docs/ip-cref/ the
> outgoing traffic could be split with "ip route add default scope link
> nexthop dev eth0 nexthop dev eth1" or something like that.
> 
this sounds neat... does 2.4 have something more powerful. like being
able to set this humongus default route to different interfaces with
a smart heuristic that determines if the link is saturated and will
avoid that link to a certain amount of time... hmmm. sounds like a good
open source project to contribute to...

> For incoming traffic I do not know. A similiar route on every node for
> every other node doesn't scale very well with many nodes I guess. Hmmm. Is
> that the reason?
> 

> 
> 
> 
> On Thu, 12 Jul 2001, Niclas Andersson wrote:
> > 
> > Hi Mike,
> > 
> 
> > I had the same problems 2 years ago but I gave up bonding. It doesn't
> > improve the latency (often more important than BW) and the stability
> > is too low.
> > 
> > The problem is that both interfaces on one system use the same
> > MAC-adress. Most switches do not tolerate two interfaces with the same
> > MAC-adress not even on separate VLANs. (There are a few that does but
> > can't remember them name of them now. The problem is that this piece
> > of information may be a little bit tricky to find. Bonding a la Becker
> > isn't that common in networks.)
> > 
> > I didn't succeed with bonding on HP2424. The reason may of course be the 
> > D-link interfaces w. DEC21143 I used which sometimes have difficulties 
> > negotiating.
> > 
> > What could work is the CISCO Ethernet channel which even the HP
> > ProCurve has.  (Be certain that the OS in the switch is recent
> > enough!) I'm not familiar with how that thing work. I only heard that
> > it looked more or less the same as the becker-bonding...
> > 
> > 
> > > I sent an email to the list last week regarding configuring our HP
> > > Procurve 4000m switch for channel-bonding.  I am still having major
> > > problems!!
> > > 
> > > If the OS was configured for channel-bonding without any switch
> > > configuration, I got only 17Mbps :-( When I turned on trunking for
> > > certain ports on the switch, I got about 100Mbps, which was only a
> > > slight improvement from 1 NIC (plus, it was using SA/DA, so there was
> > > no node-to-node bandwidth improvement).
> > > 
> > > I got a response suggesting that I should setup 2 VLANs, and have all
> > > eth0's on VLAN-1 and all eth1's on VLAN-2.  The responder said that he
> > > can get 190Mbps.  The trunking configuration is supposed to be for
> > > switch to switch configurations.  He was using an HP 2400 (or was it
> > > 2424?).  The manual I have is for both models, so I assume that it
> > > will work with mine as well.
> > > 
> > > I am still having major difficulties with getting it to work with
> > > Scyld.
> > 
> > Best regards,
> > 	Niclas
> > -- 
> > Niclas Andersson                                E-mail: nican at nsc.liu.se
> > National Supercomputer Centre                       Phone: +46 13 281464
> > Linkoping University, S-581 83 Linkoping, Sweden      Fax: +46 13 282535
> > 
> > 
> > 
> > _______________________________________________
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> > 
> 
> 
> 
> 
> 
> 
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-- 
 
--------------------------------------
William Emmanuel S. Yu
Ateneo Cervini-Eliazo Networks (ACENT)
email  :  william.s.yu at ieee.org
web    :  http://cersa.admu.edu.ph/
phone  :  63(2)4266001-5925/5904
 
I must have slipped a disk -- my pack hurts!
 
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