Diffserv-Aware Te - HP FlexNetwork HSR6600 Configuration Manual

Figure 28 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 tunnel. As
shown in
E, and the bypass tunnel is Router B—Router F—Router D. Router C is the protected device.
This mode is also called next-next-hop (NNHOP) protection.
Figure 29 FRR node protection

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 constraint-compliant for the class type.
The device supports the following DS-TE modes:
•
Prestandard mode—Proprietary DS-TE mode of Hewlett Packard Enterprise.
•
IETF mode—Complies with RFC 4124, RFC 4125, and RFC 4127.
Basic concepts
•
CT—Class Type. DS-TE allocates link bandwidth, implements constraint-based routing, and
performs admission control on a per-class type basis. A given traffic flow belongs to the same
CT on all links.
•
BC—Bandwidth Constraint. BC restricts the bandwidth for one or more CTs.
•
Bandwidth constraint model—Algorithm for implementing bandwidth constraints on different
CTs. A BC model contains two factors, the maximum number of BCs (MaxBC) and the
mappings between BCs and CTs. DS-TE supports two BC models, Russian Dolls Model (RDM)
and Maximum Allocation Model (MAM).
Figure 29, the primary CRLSP is Router A—Router B—Router C—Router D—Router
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