Hi, Tom,
On 19/2/21 18:13, Tom Herbert wrote:
[....]>> xor add this:
[RFC7098] discusses how the IPv6 FLow Label can used to enhance layer
3/4 (L3/4) load distribution and balancing for large server farms.
right after:
Thus, ECMP and Hash-based Load-
Sharing should be possible without the need to process the entire
IPv6 header chain to obtain upper-layer information to identify
flows.
I don't why this is only a "should".
This is not a requirement. We're mostly indicating possibility.
Hashing of three tuple for load
balancing works as described as evident by the fact it is in wide
deployment (consider it's been in Linux stack for it's internal load
balancing for several years and there's now over a billion devices in
the world that do this).
LB based on the FL relies on:
* Appropriate implementation of the FL
* Use of the FL in load balancers
There has been (and still is) an interesting mix of cases where one or
both of this simply do not happen.
See e.g.: https://blog.apnic.net/2018/01/11/ipv6-flow-label-misuse-hashing/
We're just the messenger here....
Thanks,
--
Fernando Gont
SI6 Networks
e-mail: fgont@xxxxxxxxxxxxxxx
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