Re: draft-ietf-ccamp-gmpls-architecture-05.txt

[Alex Zinin <zinin@psg.com>]

Randy,

> one immediate question comes to mind ... they talk of a link
> management protocl (lmp) (eg in chap 8) it seems to do just
> about what ppp does. the obvious question is 'why not use
> ppp?'

ppp control is done in-band. LMP supports the out-of-band mode, which
is important in optical networks where you can't simultaneously switch
some things through (user data) and take a look at other (control
messages). The out-of-band nature places some unique requirements
(such as 1:n control to data link ratio, link property correlation,
failure detection) that warrant a separate protocol.

Alex