Restrictions For Implementing Gmpls Uni; Information About Implementing Mpls Traffic Engineering; Overview Of Mpls Traffic Engineering; Benefits Of Mpls Traffic Engineering - Cisco ASR 9000 Series Configuration Manual
Aggregation services router mpls
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Implementing MPLS Traffic Engineering
Restrictions for Implementing GMPLS UNI
• The total number of configured GMPLS UNI controllers should not exceed the platform scale limit of
• Each UNI-N (ingress or egress) should be routable from its adjacent UNI-C. The UNI-C nodes need to
• GMPLS UNI is supported only over DWDM controllers and so, over POS and GigabitEthernet interfaces.
• GMPLS UNI is supported only with these Cisco ASR 9000 Enhanced Ethernet Line Cards:
Information About Implementing MPLS Traffic Engineering
To implement MPLS-TE, you should understand these concepts:
Overview of MPLS Traffic Engineering
MPLS-TE software enables an MPLS backbone to replicate and expand upon the traffic engineering capabilities
of Layer 2 ATM and Frame Relay networks. MPLS is an integration of Layer 2 and Layer 3 technologies.
By making traditional Layer 2 features available to Layer 3, MPLS enables traffic engineering. Thus, you can
offer in a one-tier network what now can be achieved only by overlaying a Layer 3 network on a Layer 2
network.
MPLS-TE is essential for service provider and Internet service provider (ISP) backbones. Such backbones
must support a high use of transmission capacity, and the networks must be very resilient so that they can
withstand link or node failures. MPLS-TE provides an integrated approach to traffic engineering. With MPLS,
traffic engineering capabilities are integrated into Layer 3, which optimizes the routing of IP traffic, given
the constraints imposed by backbone capacity and topology.
Related Topics
Configuring Forwarding over the MPLS-TE Tunnel, on page 160
Benefits of MPLS Traffic Engineering
MPLS-TE enables ISPs to route network traffic to offer the best service to their users in terms of throughput
and delay. By making the service provider more efficient, traffic engineering reduces the cost of the network.
Currently, some ISPs base their services on an overlay model. In the overlay model, transmission facilities
are managed by Layer 2 switching. The routers see only a fully meshed virtual topology, making most
destinations appear one hop away. If you use the explicit Layer 2 transit layer, you can precisely control how
traffic uses available bandwidth. However, the overlay model has numerous disadvantages. MPLS-TE achieves
the TE benefits of the overlay model without running a separate network and without a non-scalable, full
mesh of router interconnects.
OL-28381-02
500 GMPLS interfaces.
be routable from the UNI-N nodes too.
◦ A9K-MOD80-SE : 80G Modular Line Card, Service Edge Optimized
◦ A9K-MOD80-TR : 80G Modular Line Card, Packet Transport Optimized
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
Restrictions for Implementing GMPLS UNI
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