для Cisco Cisco IOS Software Release 12.2(27)SBC

The multilink interface must be configured with PPP encapsulation enabled. 

Link Fragmentation and Interleaving (LFI) must be configured on the bundle. Refer to the 

. 

This feature is only supported on serial interfaces with PPP encapsulation in a multilink PPP 
(MLPPP) bundle. 

Multiclass multilink PPP is not supported on ATM virtual circuits (VCs) in a Multilink PPP over 
ATM (MLPoA) bundle, Link Fragmentation and Interleaving over ATM (LFIoA) bundle, or Multilink 
PPP over Frame Relay (MLPoFR) encapsulated serial interfaces. 

The Prefix Elision and Short Sequence Numbers options in RFC 2686 are not supported. 

Multiclass multilink PPP provides the ability to fragment packets of various priorities into multiple 
classes, allowing high-priority packets to be sent between fragments of lower priorities. In multiclass 
multilink PPP, outgoing packets can be divided into four different multilink classes. Each class has its 
own governing sequence number, and the receiving network peer (bundle) sorts and processes each class 
independently. Sequence numbers are embedded in the multilink header and used internally to 
reassemble packets. 

Multiclass multilink PPP must be successfully negotiated with the peer system. If multiclass multilink 
PPP cannot be negotiated with the peer system, the router uses standard interleaving, Priority queue 
traffic is always PPP encapsulated when interleaving with non-priority traffic. 

The Cisco 10000 series router supports a maximum of 1996 multilink classes and 1250 multilink 
bundles, with up to four classes in each bundle. 

 lists the number of bundles that are supported 

system-wide based on the number of multilink classes in a bundle. 

1

1250 

2

998 

3

665 

4

499