1. DiffServ Support in MPLS Networks
References:
Juniper white paper:
“Supporting Differentiated Service Classes: Multiprotocol Label Switching (MPLS)”
IETF RFC3270:
“Multiprotocol Label Switching (MPLS) Support of Differentiated Services”

2. DiffServ Enabled MPLS
DiffServ traffic now follows an LSP directed path rather than connectionless IP paths
More predictable in terms of resource consumption and less over provisioning
Resources associated with an LSP can be reserved to provide highly predictable services
Mr. Jiang’s office hours ….. 1-3pm on Monday and Wednesday
Text is available online via the publisher’s web page for those who purchase it.
Online vesrion includes samle quizzes, some interesting simulations, links to relevaqnt web sites, and other interactive learning aids.

3. DiffServ Enabled MPLS Two types of DiffServ enabled LSPs:
EXP Inferred LSP (E-LSP): the class information is in the EXP sub-field of the MPLS shim header
Label only inferred LSP (L-LSP): the class information is implied by the label value
Mr. Jiang’s office hours ….. 1-3pm on Monday and Wednesday
Text is available online via the publisher’s web page for those who purchase it.
Online vesrion includes samle quizzes, some interesting simulations, links to relevaqnt web sites, and other interactive learning aids.

4. DiffServ Enabled MPLS An example of an E-LSP:
Mr. Jiang’s office hours ….. 1-3pm on Monday and Wednesday
Text is available online via the publisher’s web page for those who purchase it.
Online vesrion includes samle quizzes, some interesting simulations, links to relevaqnt web sites, and other interactive learning aids.

5. DiffServ Enabled MPLS An example of an E-LSP:
Mr. Jiang’s office hours ….. 1-3pm on Monday and Wednesday
Text is available online via the publisher’s web page for those who purchase it.
Online vesrion includes samle quizzes, some interesting simulations, links to relevaqnt web sites, and other interactive learning aids.

6. DiffServ Enabled MPLS Benefits of E-LSP: Limitations of E-LSP:
The operation of DiffServ over MPLS using E-LSPs is similar to the operation of DiffServ over native IP packets in the core.
Assuming a default PHB-to-EXP mapping, E-LSPs are supported by existing signaling and label distribution protocols without modification
Reducing the total number of LSPs
Limitations of E-LSP:
When an existing E-LSP is preempted, all service classes are preempted
Traffic engineering at aggregate level not per class level
Limited to 8 classes
Mr. Jiang’s office hours ….. 1-3pm on Monday and Wednesday
Text is available online via the publisher’s web page for those who purchase it.
Online vesrion includes samle quizzes, some interesting simulations, links to relevaqnt web sites, and other interactive learning aids.

7. DiffServ Enabled MPLS An example of L-LSPs:
Mr. Jiang’s office hours ….. 1-3pm on Monday and Wednesday
Text is available online via the publisher’s web page for those who purchase it.
Online vesrion includes samle quizzes, some interesting simulations, links to relevaqnt web sites, and other interactive learning aids.

8. DiffServ Enabled MPLS Benefits of L-LSP: Limitations of L-LSP:
Better capability in supporting guaranteed services
Allowing per class based traffic engineering
Allowing LSP established across an ATM network
May support more than 8 classes
Limitations of L-LSP:
Dynamic creating of an L-LSP is not supported by the existing label distribution protocols
Manual configuration can be complex and time consuming
Adding complexity to network management to support higher number of LSPs
Mr. Jiang’s office hours ….. 1-3pm on Monday and Wednesday
Text is available online via the publisher’s web page for those who purchase it.
Online vesrion includes samle quizzes, some interesting simulations, links to relevaqnt web sites, and other interactive learning aids.