HP MSR2000/3000/4000 Router Series MPLS Configuration Guide

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Figure 20 FRR link protection
• Node protection—The PLR and the MP are connected through a device and the primary CRLSP
traverses this device. When the device fails, traffic is switched to the bypass CRLSP. As shown
in Figure 21, the pr
imary CRLSP is Router A—Router B—Router C—Router D—Router E, and the
bypass CRLSP is Router B—Router F—Router D. Router C is the protected device.
Figure 21 FRR node protection
FRR deployment
Following these guidelines to deploy FRR:
• Make sure the protected link or node is not on the bypass CRLSP.
• FRR requires extra bandwidth because bypass CRLSPs must be pre-established. When network
bandwidth is insufficient, use FRR only for crucial nodes or links.
DiffServ-aware TE
DiffServ is a model that provides differentiated QoS guarantees based on class of service. MPLS TE is a
traffic engineering solution that focuses on optimizing network resources allocation.
DiffServ-aware TE (DS-TE) combines DiffServ and TE to optimize network resources allocation on a
per-service class basis. DS-TE defines different bandwidth constraints for class types. It maps each traffic
class type to the CRLSP that is constraints compliant for the class type.
The device supports these DS-TE modes:
• Prestandard mode—HP proprietary DS-TE.
• IETF mode—Complies with RFC 4124, RFC 4125, and RFC 4127.