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67Chapter 8 - The E1 and T1 Interfaces, With Signaling
Cyclades-PR4000
Multilink PPP (MLPPP) is similar in functionality to the Multichassis feature. The primary difference is that all
physical links reside in the same RAS/Router. It is similar to the CyROS Multilink capability described in section
4.4 of the CyROS Refrence Guide, but it is implemented at the data-link level instead of the network-protocol
level. When compared to Multilink, MLPPP is slightly more efficient and less generic (because it applies only to
PPP encapsulation).
Router A
Router B
Modem
Modem
Link 2 (Bundle 6)
Link 1
(Bundle 6)
Modem
Modem
FIGURE 8.8 MULTILINK PPP EXAMPLE
In Figure 8.8, Router B connects to Router A via two modem connections to achieve a larger bandwidth.
Router A accepts the two physical connections, but treats them as one logical connection (one “bundle”).
MLPPP must be enabled on all interfaces that will form this bundle, (and on both sides of the connection), with
the same bundle identifier specified for each.