[mpls] Relation between the number of special purpose labels and the depth of the label stack - Was:Re: comments on draft-kompella-mpls-special-purpose-labels-02

[Loa Andersson <[e-mail]>]

Jeff,

I want to see separate discussions on separate problems.

The way I read some of the mails in this discussion is that if we
increase the number of with one, the label stack will be one label
deeper.

I seriously doubts this, it is potentially not true even in the
were the new special purpose label is present in the label stack.
Some special purpose labels changes what is in the stack in such a way
that there are fewer labels.

Do we have any hard figures on the relationship between the number
of available number of special purpose labels and the depth of the
label stack?

Same for the number of labels to be processed, do we know which
effect special purpose labels have on how many labels that need to
be processed.

/Loa


On 2013-04-03 08:38, Jeff Wheeler wrote:
<snip>
>
> An easily solved control-plane problem is greatly preferable to the
> problem you are creating, which increases the heat/power/density
> challenges of building future LSRs, and makes existing ones unable to
> implement new features due to the deeper label stack.
>
> Was there no consideration of what problems are caused by a deeper
> label stack?  That seems to be the case.
>

-- 


Loa Andersson                        email: [e-mail]
Senior MPLS Expert                          [e-mail]
Huawei Technologies (consultant)     phone: [phone]