Joel,
My loop detector just buzzed. This is more or less where we were
a couple of drafts ago, but people said "don't say that". Now,
I never delete old xml2rfc files, so I can bring back that text.
However, I'd like the WG chairs to decide...
Bert is correct below - if a load balancer doesn't balance the load,
it won't break sessions, but it will degrade performance.
Brian
On 2011-05-09 12:02, Joel M. Halpern wrote:
> I rather hate the following idea, and I am not sure that security
> gateways would be willing to follow it.
>
> In order for flow label usage to actually help the ECMP hardware, we
> have to expect it to work.
> What if security gateways were expected to put reasonable, flow
> distributing, flow -labels on their packets?
> Put differently, what if security gateways were behaving as if the
> received flow label were 0, and they were responsible for adding flow
> labels as the spec allows?
>
> Yours,
> Joel
>
> On 5/8/2011 7:21 PM, Manfredi, Albert E wrote:
>> Brian E Carpenter wrote:
>>
>>> Nodes MUST NOT change the flow label. But since you can't detect
>>> whether
>>> it's been changed, mechanisms using the flow label for some purpose
>>> must
>>> be robust against unanticipated changes.
>>
>> If I may try to express what I perceive the problem to be, we have
>> been told that (for example, and there may be others) certain security
>> gateways DO change the value of that FL. And presumably, for good
>> security-minded reasons. So to say FL MUST NOT be changed is, I
>> gather, factually not possible anymore.
>>
>> I agree that "since you can't detect whether it's been changed,
>> mechanisms using the flow label for some purpose must be robust
>> against unanticipated changes," however I think the hard nut is this
>> MUST NOT be changed requirement.
>>
>> So for example, the load balancing use of FL must not cause the
>> session to break if FL has been changed.
>>
>> Bert
>>
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