Extreme Networks WM-4T1i - Manual (Page 27)

WM-4T1i Module Installation and User Guide 3-1
3 Configuring PPP and MLPPP
This chapter covers the following topics:
• Multilink PPP and Multilink Groups on page 3-2
• Configuring a PPP/MLPPP Link on page 3-3
• Monitoring PPP/MLPPP Links on page 3-6
• PPP/MLPPP Configuration Examples on page 3-6
Overview
Point-to-Point Protocol (PPP) is used across the entire range of communication speeds
and devices found on the internet. Typically, PPP uses Layer 3 to connect two broadcast
networks, say two ethernet LANs, into a single WAN by transporting IP packets over a
link. PPP can also use Layer 2 to bridge packets from one VLAN to another.
Multilink PPP (MLPPP) is a protocol for combining a number of PPP links into one
bundle that transports traffic over the links in the bundle. A multilink group is just a
bundle of individual PPP links that are configured to work together as a single link.
With a multilink group configured, it is easy to add or remove additional PPP links to
provide bandwidth as needed. The multilink group balances traffic among the
individual PPP links and properly sequences packets across the multilink group.
Typically, you would add a multilink group to a VLAN, configure the multilink group
by adding T1 ports and configuring PPP/MLPPP parameters, and finally, enable the
multilink group.