RE: LMP questions

[Jonathan Lang <jplang@calient.net>]

Adnan,
  In your example, you need to run an LMP control channel between B and C.
This control channel could be tunneled through A.

Thanks,
Jonathan

> -----Original Message-----
> From: Adnan Ahmed [mailto:adnan@varros.com]
> Sent: Friday, July 20, 2001 4:02 PM
> To: Jonathan Lang; ccamp@ops.ietf.org
> Cc: Saibal Das
> Subject: Re: LMP questions
> 
> 
> Jonathan:
> 
> I have a follow up question related to your response:
> 
> "Assuming that the control channels utilize an out-of-band 
> network (such
> as Ethernet) will the control channel topology i.e. the physical
> infrastructure used to realize the CCs, match the fiber topology?
> [Jonathan] The control channel topology does not need to 
> match the fiber
> technology."
> 
> Consider this scenario involving three OXCs where:
> 
> - OXCs A, B and C are connected to each other through fiber
> - Control channel CC-1 is setup b/w A & B and a control 
> channel CC-2 is
> setup b/w A & C.
> 
> Does your response above imply that it is possible to setup 
> TE/data bearing
> links between OXCs B and C by utilizing CC-1 and CC-2 without a direct
> control channel between them?
> 
> Thank you for your help.
> -- Adnan
> 
> 
> ----- Original Message -----
> From: "Jonathan Lang" <jplang@calient.net>
> To: "'Adnan Ahmed'" <adnan@varros.com>; <ccamp@ops.ietf.org>
> Cc: "Saibal Das" <saibal@varros.com>
> Sent: Friday, July 20, 2001 1:38 PM
> Subject: RE: LMP questions
> 
> 
> > Adnan,
> >   Please see inline comments.
> >
> > Thanks,
> > Jonathan
> >
> > -----Original Message-----
> > From: Adnan Ahmed [mailto:adnan@varros.com]
> > Sent: Friday, July 20, 2001 10:59 AM
> > To: ccamp@ops.ietf.org
> > Cc: Saibal Das
> > Subject: LMP questions
> >
> >
> > Hello:
> >
> > I have some questions regarding LMP:
> >
> > 1. What mechanism is used to automatically setup control 
> channels b/w two
> > nodes? Will the user or managing application update the 
> lmpNbrTable with
> > neighbouring nodes before a node initiates control channel 
> setup, or is a
> > node required to incoporate some sort of "ping" to discover 
> noeghbours and
> > then initiate CC setup?
> > [Jonathan] Currently, the draft doesn't specify a mechanism to
> automatically
> > setup control channels.  There has been some work done in 
> the OIF to do
> > this.
> >
> > 2. Assuming that the control channels utilize an 
> out-of-band network (such
> > as Ethernet) will the control channel topology i.e. the physical
> > infrastructure used to realize the CCs, match the fiber topology?
> > [Jonathan] The control channel topology does not need to 
> match the fiber
> > technology.
> >
> > 3. Can LMP TE links span multiple OXCs (as FA-LSPs do) or 
> are LMP TE links
> > only between adjacent elements?
> > [Jonathan] As LMP is currently defined, it is only between adjacent
> > elements.
> >
> > 4. The current LMP draft does not specify how TE links 
> formed by LMP are
> > updated into OSPF. Is this LMPs responsiblity or will OSPF pull this
> > information from LMP?
> > [Jonathan] This is implementation dependent.
> >
> >
> > Regards,
> > ====
> > Adnan Ahmed
> > [V] 972.503.8881 x222            [F] 972.503.8885
> >
> >
> >
>