Mpls Traffic Engineering Interarea Tunneling - Cisco ASR 9000 Series Configuration Manual

Implementing MPLS Traffic Engineering
Related Topics
Assigning Color Names to Numeric Values, on page 184
Associating Affinity-Names with TE Links, on page 185
Associating Affinity Constraints for TE Tunnels, on page 186
Configure Flexible Name-based Tunnel Constraints: Example, on page 255

MPLS Traffic Engineering Interarea Tunneling

These topics describe the following new extensions of MPLS-TE:
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Interarea Support
The MPLS-TE interarea tunneling feature allows you to establish P2P and P2MP TE tunnels spanning multiple
Interior Gateway Protocol (IGP) areas and levels, thereby eliminating the requirement that headend and tailend
routers reside in a single area.
Interarea support allows the configuration of a TE LSP that spans multiple areas, where its headend and tailend
label switched routers (LSRs) reside in different IGP areas.
Multiarea and Interarea TE are required by the customers running multiple IGP area backbones (primarily
for scalability reasons). This lets you limit the amount of flooded information, reduces the SPF duration, and
lessens the impact of a link or node failure within an area, particularly with large WAN backbones split in
multiple areas.
This figure shows a typical interarea TE network.
Figure 12: Interarea (OSPF) TE Network Diagram
OL-28381-02
Interarea Support, on page 127
Multiarea Support, on page 128
Loose Hop Expansion, on page 128
Loose Hop Reoptimization, on page 129
Fast Reroute Node Protection, on page 129
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
MPLS Traffic Engineering Interarea Tunneling
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