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MPLS using LDP and ATM VC Switching

  • From: djiang1@lucent.com
  • Date: Fri, 23 Feb 2001 16:44:42 -0500
  • X-MIMETrack: Serialize by Router on Notes01/SVR/Yurie(Release 5.0.6 |December 14, 2000) at02/23/2001 16:44:43

Hi Everyone,

I have a question regarding RFC3035.  There is a paragraph in RFC3035, page
5 to page 6, says,
"Label switching is accomplished by associating labels with Forwarding
Equivalence Classes, and using the label value to forward packets,
including determining the value of any replacement label.  See [1] for
further details.  In an ATM-LSR, the label is carried in the VPI/VCI field,
or, when two ATM-LSRs are connected via an ATM "Virtual Path", in the VCI
field."

I am wondering why it is in the VCI field rather than VPI field.  I thought
if the two ATM-LSRs are connected via virtual circuit, then forwarding
should be based on the VPI/VCI field, if the two ATM-LSRs are connected
visa virtual path, then forwarding should be based on the VPI field.

Regards,
Jane D. Jiang