Subject: RE: Question:draft-ietf-mpls-atm-03.txt

From: Shahram Davari <[email-masked]>
Date: Wed, 17 May 2000 08:52:24 -0700

Hi,

LDP is used for this purpose between ATM-LSRs. LDP uses "ATM Label Range
component", which is used during LDP initialization. 

The ATM switches in the cloud do not need to know anything about MPLS. They
pass MPLS or non-MPLS traffic transparently.

Regards
-Shahram

>-----Original Message-----
>From: Levi Daphna [mailto:[email-masked]]
>Sent: Wednesday, May 17, 2000 4:24 AM
>To: [email-masked]'
>Subject: Question:draft-ietf-mpls-atm-03.txt
>
>
>Hi
>
>I have a question concerning the MPLS-ATM draft.
>In paragraph 7.2 we deal with the scenario of ATM-LSRs which 
>are connected
>via an ATM VP cloud. (to my understanding this is an overlay model )
>7.2. Connections via an ATM VP 
>Sometimes it can be useful to treat two LSRs as adjacent (in some LSP)
>across an LC-ATM interface, even though the connection between 
>them is made
>through an ATM "cloud" via an ATM Virtual Path. In this case, 
>the VPI field
>is not available to MPLS, and the label MUST be encoded 
>entirely within the
>VCI field. 
>In this case, the default VCI value of the non-MPLS connection 
>between the
>LSRs is 32. Other values can be configured, as long as both parties are
>aware of the configured value. The VPI is set to whatever is 
>required to
>make use of the Virtual Path. 
>
>My question is: How do we set the VPI value, is it through a management
>system or is there some signaling between the ATM-LSR and the 
>VP switch.
>
>Thanks in advance,
>Daphna
>
>