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Figure 3-12: Configuration | Interfaces | WAN Card in Slot N | Port A B as T1 or E1 screen, PPP tab
PPP Multilink Parameters tab
This tab lets you configure a PPP Multilink connection on this WAN interface. PPP (Point-to-Point
Protocol) provides communication between two points over a serial interface, in this case a synchronous
line. PPP Multilink (MP) bundles both WAN ports together into one point-to-point connection to
enhance bandwidth. MP fragments the datagram and assigns data packets to both ports, usually
alternating them between the two; i.e., packet 1 to Port A, packet 2 to Port B, and so on, to balance the
load between them. At the destination, MP reassembles the packets in the correct order. RFC 1990
describes PPP Multilink.
Enable PPP Multilink
To enable PPP Multilink (MP) on this interface, check this box. The box is not checked by default.
If you enable MP, the system automatically assigns the IP address on this port to the other port. Verify
that the correct (same) IP address is on both ports. If you disable MP, verify that each port has the correct
(different) IP address. To verify the IP address, see the IP Parameters tab.
Apply / Cancel
To apply your settings to this interface and include your settings in the active configuration, click Apply .
The Manager returns to the Configuration | Interfaces screen.
Reminder:
To save the active configuration and make it the boot configuration, click the Save Needed icon at the
top of the Manager window.
To discard your settings, click Cancel . The Manager returns to the Configuration | Interfaces screen.
VPN 3000 Concentrator Series User Guide
Configuration | Interfaces | WAN Card in Slot N | Port A B as T1 or E1
End of Chapter
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