Enterasys Networks Security Router X-PeditionTM - Manual (Page 236)

Link Failure Backup Example
10-14 Configuring Dialer Services
8. Backup link is up, triggering the next action.
9. Static Backup route configured - the routing process searches its configured Static Routing
entries and installs the routes that can be reached through the backup interface.
10. Dynamic route - the routing protocol (RIP) learns of new available routes through the backup
(dialer) interface and adds them to the IP Routing and Forwarding Table.
11. Data starts passing over the backup link.
When the primary link is re-established the backup function will notify the Dialer to bring
down the dialer interface (bringing the dialed line down).
Link Failure Backup Example
Figure 10-7 illustrates a local link failure and the dial backup process.
Figure 10-7 Backup Link Failure Example
Configuring a Dialed Backup Line
The following tasks must be performed to configure a dialed backup line:
• Configure the dialer interface
• Configure a physical interface to function as backup
• Configure primary interfaces to use a backup interface
Configuring the Dialer Interface
Perform the following steps to configure the dialer interface:
1. Enter interface dialer number to create the dialer interface.
2. Enter encapsulation ppp to enable PPP encapsulation.
3. Enter dialer pool number to specify the dialer pool.
Central Site
XSR
Remote Site
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