Cisco ASR 900 Series

ppp multilink group 1
no ip address
encapsulation ppp
ip route-cache cef
no keepalive
ppp chap hostname group 1
ppp multilink
ppp multilink group 1
MPLS Basic Configuration Guide, Cisco IOS XE Everest 16.5.1 (Cisco ASR 900 Series)
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MPLS Multilink PPP Support
Example: Assigning an Interface to a Multilink Bundle