HP 7102dl - ProCurve Secure Router Configuration Manual page 435

Local network
Router
Routing Table
0.0.0.0 /0 10.1.1.1 track remote
demand 1
Local network
Router
Routing Table
0.0.0.0 /0 demand 1
Figure 9-1. Detecting a Failed Primary Route with Network Monitoring
Figure 9-2 shows another scenario, in which the local ProCurve Secure
Router establishes a site-to-site Virtual Private Network (VPN) through
the Internet. If the remote network's connection to the Internet fails, the
router at the local site places an ISDN call to connect to the remote site
directly. The router at the local site continues to forward Internet traffic
through the primary connection.
Eth 0/2
Cable
modem
Probe
ISDN
Eth 0/2
Cable
modem
Probe
Network Monitoring
HQ
server
Internet
10.1.4.12
ISP
Key destination
HQ
server
Internet
10.1.4.12
ISP
Key destination
Failure
Overview
9-7