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65Chapter 8 - The E1 and T1 Interfaces, With Signaling
Cyclades-PR4000
ISDN
Modem
Server
LAN
PR4000
MC PPP End Point Discriminator 11:22:33:44:55:66
MC PPP IP Address (Ethernet IP Address): 200.200.200.1
MC PPP End Point Discriminator 11:22:33:44:55:66
MC PPP IP Address (Ethernet IP Address): 200.200.200.2
MC PPP End Point Discriminator 11:22:33:44:55:66
MC PPP IP Address (Ethernet IP Address): 200.200.200.3
BC
Master
Primary Link
Link 1
Packet
Packet
BC
BC
PR4000
PR4000
Internet Service Provider
FIGURE 8.6 FIRST INCOMING CONNECTION OF A MULTICHASSIS PPP CIRCUIT
The RAS that receives the second connection from the same ISDN modem (shown in Figure 8.7), has already
been informed by the broadcast message that the first RAS has the primary link. The connection is set up as a
secondary link with this RAS (IP 200.200.200.3 in the example) as the slave. The information is not sent directly
to its final destination. Rather, the packets are sent to the master RAS where they are joined with packets sent
through other physical links before being forwarded to their final destination.