Dialer Watch is a alive conception of your CCNA and CCNP studies, specially for the BCRAN exam, but it's digit of the most misunderstood technologies as well. To support you transfer the CCNA and CCNP authorisation exams, here's a certain countenance at Dialer Watch.
Dialer Watch allows you to configure a distinction or routes as watched when the watched distinction leaves the routing plateau and there is no another legal distinction to that limited destination, the ISDN unification module become up. In the mass example, R1 and R2 are adjoining by both a Frame Relay darken over the 172.12.123.0 /24 meshwork and an ISDN darken using the 172.12.12.0 /24 network. The routers are streaming OSPF over the Frame cloud, and R1 is business its loopback of 1.1.1.1/32 as substantially as an Ethernet segment, 10.1.1.0/24, via OSPF. R2 has both of these routes in its OSPF table, as shown below.
R2#show ip distinction ospf
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/65 via 172.12.123.1, 00:00:07, Serial0
10.0.0.0/24 is subnetted, 1 subnets
O 10.1.1.0 [110/128 via 172.12.123.1, 00:00:08, Serial0
We poverty R2 to locate a call to R1 if either the loopback or Ethernet networks yield R2's routing table, but we don't poverty to hit to depend on engrossing traffic. That dictates the ingest of Dialer Watch.
First, configure the itemize of watched routes with dialer watch-list. Only digit of the watched routes needs to yield the routing plateau for the ISDN unification to become up. In this example, R2 module check both routes from its OSPF routing table.
Be certain with this command. The entries here requirement to correct just the routes and masks existence watched. Dialer watch-lists ingest subnet masks, not wildcard masks.
R2(config)#dialer watch-list 5 ip 10.1.1.0 255.255.255.0
R2(config)#dialer watch-list 5 ip 1.1.1.1 255.255.255.255
Configure the dialer watch-group bidding on the BRI interface, AND inclose transpose statements for the watched routes. As with dialer-list and dialer-group, the assemble sort referenced in the dialer watch-group bidding staleness correct the sort appointed to the dialer watch-list.
The Dialer Watch plan module not impact without inclose transpose statements for apiece watched route. I move this because this is the travel a aggregation of grouping yield out.
R2(config)#interface bri0
R2(config-if)#dialer watch-group 5
R2(config-if)# dialer transpose ip 1.1.1.1 255.255.255.255. think R1 5557777 broadcast
R2(config-if)# dialer transpose ip 10.1.1.0 255.255.255.0 think R1 5557777 broadcast
To effort Dialer Watch, the Serial0 programme on R2 module be closed down. Since we're streaming OSPF, the distinction plateau module be updated nearly directly and the ISDN unification should become up correct after that.
R2(config)#int s0
R2(config-if)#shut
01:12:47: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Serial0 from FULL to DOWN, N
eighbor Down: Interface downbound or detached
01:12:47: %LINK-3-UPDOWN: Interface BRI0:1, denaturized land to up
01:12:48: %SYS-5-CONFIGI: Configured from housing by console
01:12:48: %LINEPROTO-5-UPDOWN: Line prescript on Interface BRI0:1, denaturized state
to up
01:12:49: %LINK-5-CHANGED: Interface Serial0, denaturized land to administratively
down
01:12:50: %LINEPROTO-5-UPDOWN: Line prescript on Interface Serial0, denaturized state
to down
01:12:53: %ISDN-6-CONNECT: Interface BRI0:1 is today adjoining to 5557777 R1
Within fivesome seconds, the ISDN unification is up. exhibit dialer verifies that Dialer Watch is the think the distinction was brought up.
R2#show dialer
BRI0 - dialer identify = ISDN
Dial String Successes Failures Last DNIS Last status
5557777 2 0 00:00:11 successful
0 inbound call(s) hit been screened.
0 inbound call(s) unloved for callback.
BRI0:1 - dialer identify = ISDN
Idle official (120 secs), Fast indolent official (20 secs)
Wait for traveler (30 secs), Re-enable (15 secs)
Dialer land is accumulation unification place up
Dial reason: Dialing on watched distinction loss
Time until disparity 108 secs
Connected to 5557777 (R1)
A test state regarding Dialer Watch ... it module not impact with RIP, but module with every our another impulsive IGPs (IGRP, EIGRP, OSPF).
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