- Cisco ASR 901 Series Manual

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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
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Chapter 25 Configuring MLPPP
MLPPP Optimization Features
• MPLS Features Supported for MLPPP
• MPLS over MLPPP on PE-to-CE Links
• MPLS over MLPPP on Core Links
• MPLS over MLPPP on CE to PE Links
MPLS Features Supported for MLPPP
The following features are supported.
• MPLS Label imposition (LER)
• MPLS Label switching (LSR)
• MPLS VPN (L3VPN): User-Network Interface (UNI) on which virtual routing and forwarding
(VRF) is configured should be switch virtual interface (SVI) on Gigabit interfaces and
Network-to-Network Interface(NNI) can be MLPPP link
• Routing Protocols – ISIS/OSPF/BGP on MLPPP
• Label Distribution Protocol (LDP) as MPLS label protocol
• Equal Cost Multipath (ECMP) support on MLPPP links for IP to Tag (LER cases)
MPLS over MLPPP on PE-to-CE Links
Figure 1 shows a typical MPLS network in which the PE router is responsible for label imposition (at
ingress) and disposition (at egress) of the MPLS traffic.
In this topology, MLPPP is deployed on the PE-to-CE links.
Figure 1 PE to CE Links
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CE
CE
CE
CE
PE PE
P
LDP
LDP
LDP
P
MLP interfaces handling
MPLS labeled packets