Hi, 

I think you need the APA software to do proper load balancing. In 
combination with our Cisco Catalyst 6509 swithes we configured a 
Etherchannel which enabeled receive load balancing.

The apa will then create a virtual interface called lan900 and this is 
configured as an IPv4 interface. 

It is working very well on our enviroment. 


S-A






Birk Bohne <birk.bohne AT batchworks DOT de> 
26.06.2008 10:33

To
NETWORKER AT LISTSERV.TEMPLE DOT EDU
cc
Stein-Are Smoge <stein.are.smoge AT ROLLS-ROYCE DOT COM>
Subject
Re: HP-UX multiple Interfaces with same IP subnet






Thanks for sharing your experiences. So i must configure both nics as a 
team. I tried to avoid this, because of my bad experiences with teaming 
under windows and linux. All teaming configurations with different 
hardware at different customers 
show no throughput gain on the receive side. The load balancing(also 
802.3ad) works only for send packets. This is useless for backup servers 
and storage nodes... Maybe the HP-UX IP stack can surprise me this time.

greetings
Birk Bohne

----- "Stein-Are Smoge" <stein.are.smoge AT ROLLS-ROYCE DOT COM> schrieb:

> Hi, 
> 
> We tried this a couple of years ago. All clients who had the second
> NIC' 
> as "server network interface" sent their backup data to broadcast
> which 
> again caused our network to collapse.  The answer from HP was that it
> is 
> not supported. HP-UX does not work correctly when two NIC's are
> configued 
> in the same subnet. The onlky way to do that is either using bundeled
> NIC's 
> or NIC's in different subnets. 
> 
> Our solution was to buy the Auto Port Aggregation (APA. This allowed
> us to 
> bundle three NIC's into one VLAN(server LAN) and another three in a 
> different VLAN(deignated backup LAN) in two different subnets.  As APA
> in 
> combination with Cisco only supports four bundeled NIC's this was the
> only 
> solution to utilize all our six NIC's
> 
> Sorry for the bad news.
> 
> Regards
> Stein-Are Smoge
> ICT Senior Consultant
> Rolls-Royce Marine - ICT Operations - Head Office Ulsteinvik
> Email:stein.are.smoge AT rolls-royce DOT com
> Phone:        +4770014298
> Mobile:       +4795721585
> Fax:             +4770014020


 
 
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