Cisco Cisco IOS Software Release 12.2(27)SBC

This section includes the following multiclass multilink PPP procedures: 

The ppp multilink multiclass command must be configured on each link that is a member of the 
bundle, or on the multilink interface itself when multilink groups are used. Failure to configure this 
command may result in the peer refusing to allow mismatched links to join the bundle. The first link 
to join the bundle determines whether multiclass multilink PPP is in effect for the bundle. Each 
subsequent link must negotiate the same multiclass multilink PPP parameters to join the bundle. 

A maximum of four multilink classes is allowed in each multiclass multilink PPP bundle. 

The number of transmit classes negotiated with the peer must be greater than the highest 
encapsulation sequence class number configured in the outbound service policy. The service policy 
is rejected if the number of transmit classes is too small. 

The fragment size is computed at the interface multilink level when the first link is added to the 
bundle, and it applies to all links and classes.

The configuration for each link in a bundle must be identical. 

A bundle configuration must be applied prior to the start of the PPP Link Control Protocol (LCP). 
You can apply this configuration on a multilink interface and then add all links to a multilink group. 

The default sequence number for class-default is 0 and it is not configurable. 

Use the following procedure to configure multiclass multilink PPP LFI on a bundle. 

configure terminal 

interface multilink multilink-bundle-number 

ip address ip_address mask 

ppp multilink 

ppp multilink interleave 

ppp multilink fragment delay milliseconds [microseconds] 

ppp timeout multilink lost-fragment seconds [milliseconds]

ppp multilink multiclass local {request [initial init-value] [maximum max-value] | allow 
[maximum max-value] | forbid}