Cisco 1003 - 1003 Router Manual de usuario descargar pdf (Pagina 31)

Designing ISDN Internetworks 11-31

Performance

In Figure 11-9, a leased line connects Router A to Router B, and BRI 0 on Router B is used as a

backup line.

Figure 11-9 Example of Dial Backup over ISDN

Note For simplicity, this example shows IP addressing. Other protocols can also be conﬁgured.

In the following partial conﬁguration example for Router B, BRI 0 is activated only when serial

interface 0 (the primary line) goes down. The backup delay command conﬁgures the backup

connection to activate 30 seconds after serial interface 0 goes down and to remain activated for

60 seconds after the serial interface 0 comes up.

interface serial 0

ip address 171.68.158.73

backup interface bri 0

backup delay 30 60

In the following partial conﬁguration example for Router B, BRI 0 is activated only when the load

on serial 0 (the primary line) exceeds 75 percent of its bandwidth. The backup line is deactivated

when the aggregate load between the primary and backup lines is within 5 percent of the primary

line’s bandwidth.

interface serial 0

ip address 171.68.158.73

backup interface bri 0

backup load 75 5

In the following partial conﬁguration example for Router B, BRI 0 is activated only when

serial interface 0 goes down or when trafﬁc on serial interface 0 reaches exceeds 25 percent. If serial

interface 0 goes down, 10 seconds will elapse before BRI 0 becomes active. When serial interface 0

comes up, BRI 0 will remain active for 60 seconds. If BRI 0 is activated because the trafﬁc on serial

interface 0 exceeds 25 percent, BRI 0 is deactivated when the aggregate load of serial interface 0 and

BRI 0 returns to within 5 percent of the bandwidth of serial interface 0.

interface serial 0

ip address 171.68.158.73

backup interface bri 0

backup load 25 5

backup delay 10 60

Router A

Router B

171.68.158.18

255.255.255.248

171.68.158.72

255.255.255.248

171.68.158.73

255.255.255.248

171.68.158.49

255.255.255.248

BRI0

171.68.158.26

255.255.255.248

171.68.158.25

255.255.255.248

BRI1

ISDN

S4446

Leased line

BRI0

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Cisco 1003 - 1003 Router Manual de usuario Pagina 31

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