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Cisco CCNA / CCNP Certification Exam Tutorial: Dialer Watch

Dialer Watch is a vital part of your CCNA and CCNP studies, particularly for the BCRAN exam, but it's one of the most misunderstood technologies as well. To help you pass the CCNA and CCNP certification exams, here's a detailed look at Dialer Watch. Dialer Watch allows you to configure a route or routes as "watched" when the watched route leaves the routing table and there is no other valid route to that specific destination, the ISDN link will come up. In the following example, R1 and R2 are connected by both a Frame Relay cloud over the 172.123.

0 /24 network and an ISDN cloud using the 172.0 /24 network. The routers are running OSPF over the Frame cloud, and R1 is advertising its loopback of 1.

1/32 as well as an Ethernet segment, 10.0/24, via OSPF. R2 has both of these routes in its OSPF table, as shown below. R2#show ip route ospf 1.0/32 is subnetted, 1 subnets O 1.1 [110/65] via 172.123.1, 00:00:07, Serial0 10.0/24 is subnetted, 1 subnets O 10.

0 [110/128] via 172.123.1, 00:00:08, Serial0 We want R2 to place a call to R1 if either the loopback or Ethernet networks leave R2's routing table, but we don't want to have to depend on interesting traffic. That dictates the use of Dialer Watch. First, configure the list of watched routes with dialer watch-list. Only one of the watched routes needs to leave the routing table for the ISDN link to come up. In this example, R2 will watch both routes from its OSPF routing table.

Be careful with this command. The entries here need to match exactly the routes and masks being watched. Dialer watch-lists use subnet masks, not wildcard masks. R2(config)#dialer watch-list 5 ip 10.0 255.255.255.


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