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North American Network Operators Group

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Re: Server Redundancy

  • From: Paul Vixie
  • Date: Thu Aug 07 03:13:02 2003 ("Jason Robertson") writes:

> If you go out and spend a few thousand you can also get Allied Telesyn 
> L2-L4 products that now support Load Balancing.  Actually the rapier 
> 24i is about $2000 Canadian.  (I'd have to check the VAR pricing)

how much would i have to pay to not have that extra powered box between
my data and my customers?

oh, i forgot, it's zero, isn't it?


> > Using outboard appliances for "server load balancing" is unnecessary,
> > and it adds more powered boxes (thus decreasing theoretical reliability).
> > 
> > If your upstream router can speak OSPF and is made by either Cisco or
> > Juniper then it will implement ECMP (equal cost multipath).  If you put
> > your "service address" on lo0 as an alias, and you run Zebra or GateD
> > on the "service hosts" which possess that alias address, then each such
> > host will appear to be a router toward the service address as a "stub host"
> > and your upstream routers will dtrt wrt flow hashing for udp or tcp traffic
> > (that is, the udp/tcp port number will figure into the hash function, so
> > you won't multipath your tcp sessions.)
> > 
> > This is how f-root has worked for years.  Look ma, no appliances.
Paul Vixie

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