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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter25 Configuring MLPPP
Prerequisites
Prerequisites
• Cisco IOS Release 15.2(2)SNI or a later release that supports the Multiprotocol Label Switching
(MPLS) over MLPPP feature must be installed previously on the Cisco ASR 901 Series Aggregation
Services Router.
• Cisco Express Forwarding (CEF) or distributed Cisco Express Forwarding (dCEF) should be
enabled.
• MPLS should enabled on PE and P routers.
• Before enabling MPLS over MLPPP link, configure the following commands:
–
mpls label protocol ldp
–
mpls ip (configure this command over MLPPP link where IP address has been enabled)
Restrictions
• TE-FRR/LFA FRR feature is not supported on the MLPPP interface.
• Virtual Routing and Forwarding (VRF) configuration is not supported on the MLPPP interface.
• You need to shut down and bring up the MLPP interface for the following conditions:
–
On the fly fragmentation enable or disable
–
On the fly changes to the fragment size
–
Link fragmentation interleave
–
Enabling multiclass
• If the CPU command is modified when IS-IS is configured, you should remove and re-apply the
service-policy in MLPPP.
MLPPP Optimization Features
The Cisco ASR 901 supports several features that improve the performance of Multilink Point-to-Point
Protocol (MLPPP) connections and related applications such as IP over MLPPP. Some important
features are given below:
• Distributed Multilink Point-to-Point Protocol Offload
• Multiclass MLPPP
• MPLS over MLPPP
Distributed Multilink Point-to-Point Protocol Offload
Distributed Multilink Point-to-Point Protocol (dMLPPP) allows you to combine T1 or E1 connections
into a bundle that has the combined bandwidth of all of the connections in the bundle, providing
improved capacity and CPU utilization over MLPPP. The dMLPPP offload feature improves the
performance for traffic in dMLPPP applications such as IP over MLPPP by shifting processing of this
traffic from the main CPU to the network processor.