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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 22 Configuring Multilink Point-to-Point Protocol Connections
MLP-Based Link Fragmentation and Interleaving
example, if MLPoA is using 2040 multi-member bundles with 10200 member-links (5 links per
bundle), MLPoE can only use up to 10220 single-member bundles with 10220 member-links,
because the member-link pool is exhausted.
Memory and Performance Impact of MLPoE at PTA
The MLPoE at PTA feature impacts the memory and VCCI resources of the router processor (RP) to
scale MLPoE bundles.
Table 22-7 shows the MLP interface descriptor block (IDB) and VCCI
capabilities for LFI over Ethernet (LFIoE) bundles.
Table 22-7 Cisco 10000 Series Routers MLP IDB and VCCI Capabilities
The MLPoE at PTA feature does not impact to the PXF memory resources.
Note The number of MLP bundles that can be brought up with the MLPoE at PTA feature depends upon the
available system resources.
MLP-Based Link Fragmentation and Interleaving
MLP supports link fragmentation and interleaving (LFI). The MLP fragmentation mechanism multilink
encapsulates large nonreal-time packets and fragments them into a small enough size to satisfy the delay
requirements of real-time traffic. Smaller real-time packets are not multilink encapsulated. Instead, the
MLP interleaving mechanism provides a special transmit queue (priority queue) for these delay-sensitive
packets to allow the packets to be sent earlier than other packet flows. Real-time packets remain intact
and MLP interleaving mechanisms send the real-time packets between fragments of the larger non-
real-time packets.
For more information about link fragmentation and interleaving, see the “Fragmenting and Interleaving
Real-Time and Nonreal-Time Packets” chapter in the Cisco 10000 Series Router Quality of Service
Configuration Guide.
Note In PRE1, Cisco 10000 series routers support fragmentation only on single link bundles when configured
for LFI, using the ppp multilink interleave command. However, for multiple link bundles, the router
does not support fragmentation and interleaving. You can turn off fragmentation by using the no ppp
multilink fragmentation command on the Cisco 10000 router and the peer end.
Configuring MLP Bundles and Member Links
Table 22-8 shows the components you must define when configuring MLP (without link fragmentation
and interleaving) on specific interface types.
Bundle Type Total
Bundles
supported
Members
per Bundle
SWIDB/HW
IDB used
per bundle
Total of
SW/HW
IDBs
maximum
used
VCCIs used
per Bundle
Total VCCIs
maximum
used
LFIoE 10240 1 2 20480 2 20480