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Chapter 11
Multilink PPP Support for the Cisco ASR 1000 Series Routers
Cisco IOS XE Scaling Limits for MLP Bundles
Cisco IOS XE Scaling Limits for MLP Bundles
This section lists the scaling limits for MLP bundles in different releases of Cisco IOS XE, in which
scaling limits were either introduced or enhanced.
Release 2.2.(O)S
In Cisco IOS XE Release 2.2.(O)S, the MLP feature was introduced on the Cisco ASR 1000 Series
Aggregation Services Routers. MLPoSerial was the first supported transport. In this release, MLP
bundles can consist of up to 10 serial links. The bandwidth of each link interface does not have to be the
same as the other links in the bundle. The Cisco ASR 1000 Series Aggregation Services Routers support
links of types T1, E1, and NxDS0. MLP LFI is fully supported with MLPoSerial in this release.
Release 3.4.(O)S
In Cisco IOS XE Release 3.4.(O)S, the MLP feature was enhanced to enable the Cisco ASR 1000 Series
Aggregation Services Routers to act as LAC, LNS, or PTA devices. Support for tunneling bundles
between the LAC device and the LNS device was added. In this release, transport between the LAC
device and the LNS device is Layer 2 Tunnel Protocol (L2TP). The L2TP tunnels can operate on either
1-Gbps or 10-Gbps interfaces. When ASR 1000 Series Aggregation Services Router acts as an LNS
device, it terminates the MLP bundles coming through the L2TP tunnel from the LAC. In this release,
support was added for MLP upstream fragment reassembly, but not for MLP downstream fragmentation.
Release 3.7.1S
In Cisco IOS XE Release 3.7.1S, the existing support for the MLP feature in a broadband topology was
enhanced. The scaling limits were increased for the Ethernet transports, and downstream fragmentation
support was added for the broadband topologies.
In this release, when a Cisco ASR 1000 Series Aggregation Services Router acts as an LNS device, it
terminates the MLP bundles coming through the L2TP tunnel from the LAC. The scaling targets
mentioned for MLP over broadband are based on RP2/ESP40 and 2RU-VE hardware configurations. The
scaling capabilities are less for RP1 and ESP5, ESP10, or ESP20.
The implementation of MLP on a Cisco ASR 1000 Series Aggregation Services Router does not support
all the Cisco IOS XE interoperability features.
Release 3.12.(O)S
In Cisco IOS XE Release 3.12.(O)S, the multi-member-link MLPoA or MLPoEoA, including Downstream
, is introduced. The scaling limits are increased for the member links in MLPoA or MLPoEoA scenarios.
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
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