HP 7102dl - ProCurve Secure Router Configuration Manual page 104

Configuring Backup WAN Connections
Determining a Backup Method
Frame Relay
10.1.1.0
over E1
Main Router
To: 10.4.4.23
From: 10.2.2.5
Switch
Primary connection is available, so
10.2.2.0
traffic is routed over Frame Relay
connection
Routing Table
C 10.1.1.0/30 is directly connected, fr 1.1
C 10.2.2.0/24 is directly connected, eth 0/1
C 10.10.10.0/30 is directly connected, demand 1
S 10.4.4.0/24 [1/0] via 0.0.0.0, fr 1.1
3-16
Figure 3-4 shows how a backup connection is established if demand routing is
configured. Figure 3-5 shows how a persistent backup connection is established.
10.4.4.0
Office Router
Figure 3-4. Demand Routing for a Backup Connection
10.1.1.0
Main Router
Primary
connection
fails
Switch
10.2.2.0
Routing Table
C 10.2.2.0/24 is directly connected, eth 0/1
C 10.10.10.0/30 is directly connected, demand 1
S 10.4.4.0/24 [2/0] via 0.0.0.0, demand 1
ip access-list extended RouterA
permit ip 10.2.2.0
Connection
triggered by
10.4.4.0
interesting traffic
Office Router
To: 10.4.4.23
From: 10.2.2.5
Primary connection is unavailable, so
traffic is routed to demand interface.
ACL determines which traffic triggers
dial-up connection.
0.0.0.255 10.4.4.0 0.0.0.255