Re: [mpls] comments on draft-kompella-mpls-special-purpose-labels-02

[Saku Ytti <[e-mail]>]

On (2013-03-21 14:11 -0400), Jeff Wheeler wrote:

> Do any routers exist where it is easier to deploy support for extended
> special purpose labels than for simply growing the reservation?  My

I'm quite interested in this as well. If someone can think of practical
example of MPLS product in use, where by HW labels 16 through say 16k will
be used and cannot not be used via software update, it would be easy to
disregard option of extending space.

I'm not concerned of trio or ezchip style products, I'm sure those will
adapt with very low cost to what we can think of essentially 8B mpls label
when certain 20b magic exists. But 'l3 switch' style products might be
problematic (7600, brocade, EX8k)

How commonly do we foresee the need for multiple subsequent SP labels, such
as [ 15 ext1 15 ext2 15 ext3 igp vpn ]? If this seems common, what would be
the implications of dedicating one bit in SP label for EOE or
end-of-extension?  So we'd have [15 ext1 ext2 ext3 igp vpn] with EOE bit
off in ext[12] and on in ext3.

-- 
  ++ytti