Cisco 10000 - Manual (Page 441)

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Cisco 10000 Series Router Software Configuration Guide
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Chapter 19 Configuring Multilink Point-to-Point Protocol Connections
MLPoE LAC Switching
• Virtual-access bundle support for existing MLP features is not included in this release.
• Due to changes in route or switching to backup because of problems on the line, dynamic changing
of the physical tunnel interface (the Gigabit Ethernet and ATM on which the L2TP tunnel for
MLPoLNS bundle is negotiated) can happen. These changes require the bundles to renegotiate.
• For multi-member bundles, carve out and reserve the bandwidth from the physical interface, which
is the trunk interface on which the L2TP tunnel is negotiated. The bandwidth available for use on
the trunk interface or other connection is reduced by the sum of the bandwidth reserved for the
bundle.
Bandwidth available = Gigabit Ethernet or ATM VC - Bandwidth of bundle
Bandwidth available = Gigabit Ethernet or ATM VC - (Bandwidth of bundle 1 + Bandwidth of
bundle 2)
• Packet loss during oversubscription and congestion is not fixed.
• MLP on LNS sessions are torn down when there is a Hw-module reset or a physical OIR of an ATM
line card in a tunnel interface.
Configuring MLP on LNS
You can refer to the following sections for configuring MLP on LNS:
• Required Configuration Tasks for LNS, page 5-29
• Optional Configuration Tasks for LNS, page 5-30
For a configuration example of the MLP on LNS feature, see the Configuration Example for MLP on
LNS, page 19-36 .
MLPoE LAC Switching
In the Cisco IOS 12.2(33)SB release, MLP bundling on LNS was supported. In the Cisco IOS
12.2(33)SB2 release, there is added support for switching MLPoEoVLAN sessions received on the LAC
to the LNS. However, due to PXF resource limitations, this feature is supported on the PRE3 platform
only.
For a configuration example of the MLP over Ethernet (MLPoE) LAC Switching feature, see
Configuration Example for MLPoE LAC Switching, page 19-37 .
The MLPoE LAC Switching is described in the following section:
• Restrictions for MLPoE LAC Switching
Restrictions for MLPoE LAC Switching
In Cisco IOS Release 12.2(33)SB2, the MLPoE LAC Switching feature has the following restrictions:
• MLPoVLAN encapsulation (between the CPE and LAC) is supported. MLPoEoE and
MLPoEoQinQ is not supported.
• L2TP tunnel over Gigabit Ethernet (between the LAC and LNS) and ATM is supported. However,
VLAN and QinQ encapsulations for the L2TP tunnel are not supported.
• Similar to the MLP on LNS feature, bundles are only supported with Gigabit Ethernet and ATM as
the trunk between the LAC and LNS.